diff --git a/packages/i18n/README.md b/packages/i18n/README.md
index 43e4177554..7971dc2bfb 100644
--- a/packages/i18n/README.md
+++ b/packages/i18n/README.md
@@ -1,6 +1,6 @@
 # Better Auth i18n Plugin
 
-Internationalization plugin for [Better Auth](https://www.better-auth.com) — translate error messages and UI strings.
+Internationalization plugin for [Better Auth](https://www.better-auth.com) — translate error messages based on the detected locale.
 
 ## Installation
 
@@ -8,6 +8,109 @@ Internationalization plugin for [Better Auth](https://www.better-auth.com) — t
 npm install @better-auth/i18n
 ```
 
+## Built-in translations
+
+The package ships with ready-to-use translations for 22 languages:
+
+| Code | Language  |
+|------|-----------|
+| `ar` | Arabic |
+| `bn` | Bengali |
+| `de` | German |
+| `en` | English |
+| `es` | Spanish |
+| `fa` | Persian (Farsi) |
+| `fr` | French |
+| `hi` | Hindi |
+| `id` | Indonesian |
+| `it` | Italian |
+| `ja` | Japanese |
+| `ko` | Korean |
+| `nl` | Dutch |
+| `pl` | Polish |
+| `pt` | Portuguese |
+| `ru` | Russian |
+| `sv` | Swedish |
+| `th` | Thai |
+| `tr` | Turkish |
+| `uk` | Ukrainian |
+| `vi` | Vietnamese |
+| `zh` | Chinese (Simplified) |
+
+### Use all built-in locales
+
+```ts
+import { betterAuth } from "better-auth";
+import { i18n, locales } from "@better-auth/i18n";
+
+export const auth = betterAuth({
+  plugins: [
+    i18n({ translations: locales }),
+  ],
+});
+```
+
+### Use a subset of locales
+
+```ts
+import { i18n, locales } from "@better-auth/i18n";
+
+export const auth = betterAuth({
+  plugins: [
+    i18n({
+      translations: {
+        en: locales.en,
+        fr: locales.fr,
+      },
+    }),
+  ],
+});
+```
+
+### Override specific messages
+
+```ts
+import { i18n, locales } from "@better-auth/i18n";
+
+export const auth = betterAuth({
+  plugins: [
+    i18n({
+      translations: {
+        ...locales,
+        fr: {
+          ...locales.fr,
+          USER_NOT_FOUND: "Membre introuvable",
+        },
+      },
+    }),
+  ],
+});
+```
+
+### Add a custom locale
+
+```ts
+import { i18n, locales } from "@better-auth/i18n";
+import type { TranslationDictionary } from "@better-auth/i18n";
+
+const myLocale: TranslationDictionary = {
+  USER_NOT_FOUND: "...",
+  INVALID_EMAIL_OR_PASSWORD: "...",
+  // ... other error codes
+};
+
+export const auth = betterAuth({
+  plugins: [
+    i18n({
+      translations: {
+        ...locales,
+        xx: myLocale,
+      },
+    }),
+  ],
+});
+```
+
 ## Documentation
 
 For full documentation, visit [better-auth.com/docs/plugins/i18n](https://www.better-auth.com/docs/plugins/i18n).
diff --git a/packages/i18n/package.json b/packages/i18n/package.json
index 060d9b5ade..8c41d928da 100644
--- a/packages/i18n/package.json
+++ b/packages/i18n/package.json
@@ -46,6 +46,11 @@
       "dev-source": "./src/client.ts",
       "types": "./dist/client.d.mts",
       "default": "./dist/client.mjs"
+    },
+    "./locales": {
+      "dev-source": "./src/locales/index.ts",
+      "types": "./dist/locales/index.d.mts",
+      "default": "./dist/locales/index.mjs"
     }
   },
   "typesVersions": {
@@ -55,6 +60,9 @@
       ],
       "client": [
         "./dist/client.d.mts"
+      ],
+      "locales": [
+        "./dist/locales/index.d.mts"
       ]
     }
   },
diff --git a/packages/i18n/src/i18n.test.ts b/packages/i18n/src/i18n.test.ts
index 8651dd86e4..decb76b312 100644
--- a/packages/i18n/src/i18n.test.ts
+++ b/packages/i18n/src/i18n.test.ts
@@ -1,6 +1,7 @@
 import { getTestInstance } from "better-auth/test";
 import { describe, expect, it } from "vitest";
 import { i18n } from ".";
+import * as locales from "./locales";
 
 const translations = {
 	en: {
@@ -374,4 +375,99 @@ describe("i18n plugin", async () => {
 			}).toThrow("i18n plugin: translations object is empty");
 		});
 	});
+
+	describe("built-in locales", () => {
+		it("should export all expected built-in locales", () => {
+			const expectedLocales = [
+				"ar",
+				"bn",
+				"de",
+				"en",
+				"es",
+				"fa",
+				"fr",
+				"hi",
+				"id",
+				"it",
+				"ja",
+				"ko",
+				"nl",
+				"pl",
+				"pt",
+				"ru",
+				"sv",
+				"th",
+				"tr",
+				"uk",
+				"vi",
+				"zh",
+			];
+
+			for (const locale of expectedLocales) {
+				expect(locales).toHaveProperty(locale);
+				expect(
+					typeof (locales as Record<string, unknown>)[locale],
+				).toBe("object");
+			}
+		});
+
+		it("should translate errors using built-in locales", async () => {
+			const { auth: authWithBuiltInLocales } = await getTestInstance({
+				plugins: [
+					i18n({
+						translations: locales,
+						defaultLocale: "en",
+						detection: ["header"],
+					}),
+				],
+			});
+
+			const response = await authWithBuiltInLocales.api.signInEmail({
+				body: {
+					email: "nonexistent@example.com",
+					password: "wrongpassword",
+				},
+				headers: {
+					"Accept-Language": "fr",
+				},
+				asResponse: true,
+			});
+
+			const body = await response.json();
+			expect(body.code).toBe("INVALID_EMAIL_OR_PASSWORD");
+			expect(body.message).toBe(locales.fr.INVALID_EMAIL_OR_PASSWORD);
+		});
+
+		it("should contain common error codes in every built-in locale", () => {
+			const requiredKeys = [
+				"USER_NOT_FOUND",
+				"INVALID_PASSWORD",
+				"INVALID_EMAIL",
+				"INVALID_EMAIL_OR_PASSWORD",
+				"EMAIL_NOT_VERIFIED",
+				"PASSWORD_TOO_SHORT",
+				"PASSWORD_TOO_LONG",
+				"USER_ALREADY_EXISTS",
+				"SESSION_EXPIRED",
+				"ACCOUNT_NOT_FOUND",
+			];
+
+			for (const [locale, dict] of Object.entries(locales)) {
+				for (const key of requiredKeys) {
+					expect(
+						dict,
+						`Locale "${locale}" is missing key "${key}"`,
+					).toHaveProperty(key);
+					expect(
+						typeof (dict as Record<string, unknown>)[key],
+						`Locale "${locale}" key "${key}" must be a non-empty string`,
+					).toBe("string");
+					expect(
+						(dict as Record<string, string>)[key].length,
+						`Locale "${locale}" key "${key}" must not be empty`,
+					).toBeGreaterThan(0);
+				}
+			}
+		});
+	});
 });
diff --git a/packages/i18n/src/index.ts b/packages/i18n/src/index.ts
index cb9508b76c..b412e4bcb7 100644
--- a/packages/i18n/src/index.ts
+++ b/packages/i18n/src/index.ts
@@ -13,6 +13,8 @@ export type {
 	TranslationDictionary,
 } from "./types";
 
+export * as locales from "./locales";
+
 declare module "@better-auth/core" {
 	interface BetterAuthPluginRegistry<AuthOptions, Options> {
 		i18n: {
diff --git a/packages/i18n/src/locales/ar.ts b/packages/i18n/src/locales/ar.ts
new file mode 100644
index 0000000000..f4606be9de
--- /dev/null
+++ b/packages/i18n/src/locales/ar.ts
@@ -0,0 +1,43 @@
+import type { TranslationDictionary } from "../types";
+
+/**
+ * Arabic translations
+ */
+export const ar: TranslationDictionary = {
+	USER_NOT_FOUND: "المستخدم غير موجود",
+	FAILED_TO_CREATE_USER: "فشل في إنشاء المستخدم",
+	FAILED_TO_CREATE_SESSION: "فشل في إنشاء الجلسة",
+	FAILED_TO_UPDATE_USER: "فشل في تحديث المستخدم",
+	FAILED_TO_GET_SESSION: "فشل في الحصول على الجلسة",
+	INVALID_PASSWORD: "كلمة المرور غير صالحة",
+	INVALID_EMAIL: "البريد الإلكتروني غير صالح",
+	INVALID_EMAIL_OR_PASSWORD: "البريد الإلكتروني أو كلمة المرور غير صالحة",
+	INVALID_USER: "مستخدم غير صالح",
+	SOCIAL_ACCOUNT_ALREADY_LINKED: "الحساب الاجتماعي مرتبط بالفعل",
+	PROVIDER_NOT_FOUND: "مزود الخدمة غير موجود",
+	INVALID_TOKEN: "الرمز المميز غير صالح",
+	TOKEN_EXPIRED: "انتهت صلاحية الرمز المميز",
+	FAILED_TO_GET_USER_INFO: "فشل في الحصول على معلومات المستخدم",
+	USER_EMAIL_NOT_FOUND: "بريد المستخدم الإلكتروني غير موجود",
+	EMAIL_NOT_VERIFIED: "البريد الإلكتروني غير مُحقق",
+	PASSWORD_TOO_SHORT: "كلمة المرور قصيرة جداً",
+	PASSWORD_TOO_LONG: "كلمة المرور طويلة جداً",
+	USER_ALREADY_EXISTS: "المستخدم موجود بالفعل",
+	USER_ALREADY_EXISTS_USE_ANOTHER_EMAIL:
+		"المستخدم موجود بالفعل. استخدم بريداً إلكترونياً آخر.",
+	EMAIL_CAN_NOT_BE_UPDATED: "لا يمكن تحديث البريد الإلكتروني",
+	CREDENTIAL_ACCOUNT_NOT_FOUND: "حساب بيانات الاعتماد غير موجود",
+	SESSION_EXPIRED: "انتهت الجلسة. أعد المصادقة لتنفيذ هذا الإجراء.",
+	FAILED_TO_UNLINK_LAST_ACCOUNT: "لا يمكنك إلغاء ربط حسابك الأخير",
+	ACCOUNT_NOT_FOUND: "الحساب غير موجود",
+	USER_ALREADY_HAS_PASSWORD:
+		"المستخدم لديه كلمة مرور بالفعل. قدمها لحذف الحساب.",
+	VERIFICATION_EMAIL_NOT_ENABLED: "بريد التحقق غير مفعّل",
+	EMAIL_ALREADY_VERIFIED: "البريد الإلكتروني مُحقق بالفعل",
+	EMAIL_MISMATCH: "البريد الإلكتروني غير متطابق",
+	SESSION_NOT_FRESH: "الجلسة ليست حديثة",
+	LINKED_ACCOUNT_ALREADY_EXISTS: "الحساب المرتبط موجود بالفعل",
+	VALIDATION_ERROR: "خطأ في التحقق",
+	MISSING_FIELD: "هذا الحقل مطلوب",
+	PASSWORD_ALREADY_SET: "المستخدم لديه كلمة مرور محددة بالفعل",
+};
diff --git a/packages/i18n/src/locales/bn.ts b/packages/i18n/src/locales/bn.ts
new file mode 100644
index 0000000000..d966ce8eb0
--- /dev/null
+++ b/packages/i18n/src/locales/bn.ts
@@ -0,0 +1,45 @@
+import type { TranslationDictionary } from "../types";
+
+/**
+ * Bengali translations
+ */
+export const bn: TranslationDictionary = {
+	USER_NOT_FOUND: "ব্যবহারকারী পাওয়া যায়নি",
+	FAILED_TO_CREATE_USER: "ব্যবহারকারী তৈরি করতে ব্যর্থ",
+	FAILED_TO_CREATE_SESSION: "সেশন তৈরি করতে ব্যর্থ",
+	FAILED_TO_UPDATE_USER: "ব্যবহারকারী আপডেট করতে ব্যর্থ",
+	FAILED_TO_GET_SESSION: "সেশন পেতে ব্যর্থ",
+	INVALID_PASSWORD: "অবৈধ পাসওয়ার্ড",
+	INVALID_EMAIL: "অবৈধ ইমেইল ঠিকানা",
+	INVALID_EMAIL_OR_PASSWORD: "অবৈধ ইমেইল বা পাসওয়ার্ড",
+	INVALID_USER: "অবৈধ ব্যবহারকারী",
+	SOCIAL_ACCOUNT_ALREADY_LINKED: "সোশ্যাল অ্যাকাউন্ট ইতিমধ্যে লিঙ্ক করা আছে",
+	PROVIDER_NOT_FOUND: "প্রদানকারী পাওয়া যায়নি",
+	INVALID_TOKEN: "অবৈধ টোকেন",
+	TOKEN_EXPIRED: "টোকেনের মেয়াদ শেষ",
+	FAILED_TO_GET_USER_INFO: "ব্যবহারকারীর তথ্য পেতে ব্যর্থ",
+	USER_EMAIL_NOT_FOUND: "ব্যবহারকারীর ইমেইল পাওয়া যায়নি",
+	EMAIL_NOT_VERIFIED: "ইমেইল যাচাই করা হয়নি",
+	PASSWORD_TOO_SHORT: "পাসওয়ার্ড অনেক ছোট",
+	PASSWORD_TOO_LONG: "পাসওয়ার্ড অনেক বড়",
+	USER_ALREADY_EXISTS: "ব্যবহারকারী ইতিমধ্যে বিদ্যমান",
+	USER_ALREADY_EXISTS_USE_ANOTHER_EMAIL:
+		"ব্যবহারকারী ইতিমধ্যে বিদ্যমান। অন্য ইমেইল ব্যবহার করুন।",
+	EMAIL_CAN_NOT_BE_UPDATED: "ইমেইল আপডেট করা যাবে না",
+	CREDENTIAL_ACCOUNT_NOT_FOUND: "শংসাপত্র অ্যাকাউন্ট পাওয়া যায়নি",
+	SESSION_EXPIRED:
+		"সেশন শেষ হয়ে গেছে। এই কাজটি সম্পাদন করতে পুনরায় প্রমাণীকরণ করুন।",
+	FAILED_TO_UNLINK_LAST_ACCOUNT:
+		"আপনি আপনার শেষ অ্যাকাউন্টের লিঙ্ক সরাতে পারবেন না",
+	ACCOUNT_NOT_FOUND: "অ্যাকাউন্ট পাওয়া যায়নি",
+	USER_ALREADY_HAS_PASSWORD:
+		"ব্যবহারকারীর ইতিমধ্যে একটি পাসওয়ার্ড আছে। অ্যাকাউন্ট মুছতে সেটি দিন।",
+	VERIFICATION_EMAIL_NOT_ENABLED: "যাচাইকরণ ইমেইল সক্রিয় নেই",
+	EMAIL_ALREADY_VERIFIED: "ইমেইল ইতিমধ্যে যাচাই করা হয়েছে",
+	EMAIL_MISMATCH: "ইমেইল মেলে না",
+	SESSION_NOT_FRESH: "সেশন সতেজ নয়",
+	LINKED_ACCOUNT_ALREADY_EXISTS: "লিঙ্ক করা অ্যাকাউন্ট ইতিমধ্যে বিদ্যমান",
+	VALIDATION_ERROR: "যাচাইকরণ ত্রুটি",
+	MISSING_FIELD: "এই ক্ষেত্রটি আবশ্যক",
+	PASSWORD_ALREADY_SET: "ব্যবহারকারীর পাসওয়ার্ড ইতিমধ্যে সেট করা আছে",
+};
diff --git a/packages/i18n/src/locales/de.ts b/packages/i18n/src/locales/de.ts
new file mode 100644
index 0000000000..d3bf91f37e
--- /dev/null
+++ b/packages/i18n/src/locales/de.ts
@@ -0,0 +1,46 @@
+import type { TranslationDictionary } from "../types";
+
+/**
+ * German translations
+ */
+export const de: TranslationDictionary = {
+	USER_NOT_FOUND: "Benutzer nicht gefunden",
+	FAILED_TO_CREATE_USER: "Benutzer konnte nicht erstellt werden",
+	FAILED_TO_CREATE_SESSION: "Sitzung konnte nicht erstellt werden",
+	FAILED_TO_UPDATE_USER: "Benutzer konnte nicht aktualisiert werden",
+	FAILED_TO_GET_SESSION: "Sitzung konnte nicht abgerufen werden",
+	INVALID_PASSWORD: "Ungültiges Passwort",
+	INVALID_EMAIL: "Ungültige E-Mail-Adresse",
+	INVALID_EMAIL_OR_PASSWORD: "Ungültige E-Mail-Adresse oder Passwort",
+	INVALID_USER: "Ungültiger Benutzer",
+	SOCIAL_ACCOUNT_ALREADY_LINKED: "Social-Media-Konto bereits verknüpft",
+	PROVIDER_NOT_FOUND: "Anbieter nicht gefunden",
+	INVALID_TOKEN: "Ungültiges Token",
+	TOKEN_EXPIRED: "Token abgelaufen",
+	FAILED_TO_GET_USER_INFO:
+		"Benutzerinformationen konnten nicht abgerufen werden",
+	USER_EMAIL_NOT_FOUND: "Benutzer-E-Mail nicht gefunden",
+	EMAIL_NOT_VERIFIED: "E-Mail-Adresse nicht verifiziert",
+	PASSWORD_TOO_SHORT: "Passwort zu kurz",
+	PASSWORD_TOO_LONG: "Passwort zu lang",
+	USER_ALREADY_EXISTS: "Benutzer existiert bereits",
+	USER_ALREADY_EXISTS_USE_ANOTHER_EMAIL:
+		"Benutzer existiert bereits. Bitte verwenden Sie eine andere E-Mail-Adresse.",
+	EMAIL_CAN_NOT_BE_UPDATED: "E-Mail-Adresse kann nicht aktualisiert werden",
+	CREDENTIAL_ACCOUNT_NOT_FOUND: "Anmeldekonto nicht gefunden",
+	SESSION_EXPIRED:
+		"Sitzung abgelaufen. Bitte authentifizieren Sie sich erneut, um diese Aktion durchzuführen.",
+	FAILED_TO_UNLINK_LAST_ACCOUNT:
+		"Sie können Ihr letztes Konto nicht trennen",
+	ACCOUNT_NOT_FOUND: "Konto nicht gefunden",
+	USER_ALREADY_HAS_PASSWORD:
+		"Der Benutzer hat bereits ein Passwort. Geben Sie dieses an, um das Konto zu löschen.",
+	VERIFICATION_EMAIL_NOT_ENABLED: "Bestätigungs-E-Mail ist nicht aktiviert",
+	EMAIL_ALREADY_VERIFIED: "E-Mail-Adresse ist bereits verifiziert",
+	EMAIL_MISMATCH: "E-Mail-Adressen stimmen nicht überein",
+	SESSION_NOT_FRESH: "Sitzung ist nicht aktuell",
+	LINKED_ACCOUNT_ALREADY_EXISTS: "Verknüpftes Konto existiert bereits",
+	VALIDATION_ERROR: "Validierungsfehler",
+	MISSING_FIELD: "Dieses Feld ist erforderlich",
+	PASSWORD_ALREADY_SET: "Benutzer hat bereits ein Passwort festgelegt",
+};
diff --git a/packages/i18n/src/locales/en.ts b/packages/i18n/src/locales/en.ts
new file mode 100644
index 0000000000..1943a24592
--- /dev/null
+++ b/packages/i18n/src/locales/en.ts
@@ -0,0 +1,44 @@
+import type { TranslationDictionary } from "../types";
+
+/**
+ * English translations (default)
+ */
+export const en: TranslationDictionary = {
+	USER_NOT_FOUND: "User not found",
+	FAILED_TO_CREATE_USER: "Failed to create user",
+	FAILED_TO_CREATE_SESSION: "Failed to create session",
+	FAILED_TO_UPDATE_USER: "Failed to update user",
+	FAILED_TO_GET_SESSION: "Failed to get session",
+	INVALID_PASSWORD: "Invalid password",
+	INVALID_EMAIL: "Invalid email",
+	INVALID_EMAIL_OR_PASSWORD: "Invalid email or password",
+	INVALID_USER: "Invalid user",
+	SOCIAL_ACCOUNT_ALREADY_LINKED: "Social account already linked",
+	PROVIDER_NOT_FOUND: "Provider not found",
+	INVALID_TOKEN: "Invalid token",
+	TOKEN_EXPIRED: "Token expired",
+	FAILED_TO_GET_USER_INFO: "Failed to get user info",
+	USER_EMAIL_NOT_FOUND: "User email not found",
+	EMAIL_NOT_VERIFIED: "Email not verified",
+	PASSWORD_TOO_SHORT: "Password too short",
+	PASSWORD_TOO_LONG: "Password too long",
+	USER_ALREADY_EXISTS: "User already exists",
+	USER_ALREADY_EXISTS_USE_ANOTHER_EMAIL:
+		"User already exists. Use another email.",
+	EMAIL_CAN_NOT_BE_UPDATED: "Email cannot be updated",
+	CREDENTIAL_ACCOUNT_NOT_FOUND: "Credential account not found",
+	SESSION_EXPIRED:
+		"Session expired. Re-authenticate to perform this action.",
+	FAILED_TO_UNLINK_LAST_ACCOUNT: "You can't unlink your last account",
+	ACCOUNT_NOT_FOUND: "Account not found",
+	USER_ALREADY_HAS_PASSWORD:
+		"User already has a password. Provide that to delete the account.",
+	VERIFICATION_EMAIL_NOT_ENABLED: "Verification email isn't enabled",
+	EMAIL_ALREADY_VERIFIED: "Email is already verified",
+	EMAIL_MISMATCH: "Email mismatch",
+	SESSION_NOT_FRESH: "Session is not fresh",
+	LINKED_ACCOUNT_ALREADY_EXISTS: "Linked account already exists",
+	VALIDATION_ERROR: "Validation error",
+	MISSING_FIELD: "Field is required",
+	PASSWORD_ALREADY_SET: "User already has a password set",
+};
diff --git a/packages/i18n/src/locales/es.ts b/packages/i18n/src/locales/es.ts
new file mode 100644
index 0000000000..606b91c176
--- /dev/null
+++ b/packages/i18n/src/locales/es.ts
@@ -0,0 +1,46 @@
+import type { TranslationDictionary } from "../types";
+
+/**
+ * Spanish translations
+ */
+export const es: TranslationDictionary = {
+	USER_NOT_FOUND: "Usuario no encontrado",
+	FAILED_TO_CREATE_USER: "Error al crear el usuario",
+	FAILED_TO_CREATE_SESSION: "Error al crear la sesión",
+	FAILED_TO_UPDATE_USER: "Error al actualizar el usuario",
+	FAILED_TO_GET_SESSION: "Error al obtener la sesión",
+	INVALID_PASSWORD: "Contraseña inválida",
+	INVALID_EMAIL: "Correo electrónico inválido",
+	INVALID_EMAIL_OR_PASSWORD: "Correo electrónico o contraseña inválidos",
+	INVALID_USER: "Usuario inválido",
+	SOCIAL_ACCOUNT_ALREADY_LINKED: "La cuenta social ya está vinculada",
+	PROVIDER_NOT_FOUND: "Proveedor no encontrado",
+	INVALID_TOKEN: "Token inválido",
+	TOKEN_EXPIRED: "Token expirado",
+	FAILED_TO_GET_USER_INFO:
+		"Error al obtener la información del usuario",
+	USER_EMAIL_NOT_FOUND: "Correo electrónico del usuario no encontrado",
+	EMAIL_NOT_VERIFIED: "Correo electrónico no verificado",
+	PASSWORD_TOO_SHORT: "Contraseña demasiado corta",
+	PASSWORD_TOO_LONG: "Contraseña demasiado larga",
+	USER_ALREADY_EXISTS: "El usuario ya existe",
+	USER_ALREADY_EXISTS_USE_ANOTHER_EMAIL:
+		"El usuario ya existe. Usa otro correo electrónico.",
+	EMAIL_CAN_NOT_BE_UPDATED: "El correo electrónico no puede actualizarse",
+	CREDENTIAL_ACCOUNT_NOT_FOUND: "Cuenta de credenciales no encontrada",
+	SESSION_EXPIRED:
+		"Sesión expirada. Vuelve a autenticarte para realizar esta acción.",
+	FAILED_TO_UNLINK_LAST_ACCOUNT: "No puedes desvincular tu última cuenta",
+	ACCOUNT_NOT_FOUND: "Cuenta no encontrada",
+	USER_ALREADY_HAS_PASSWORD:
+		"El usuario ya tiene una contraseña. Proporciónala para eliminar la cuenta.",
+	VERIFICATION_EMAIL_NOT_ENABLED:
+		"El correo de verificación no está habilitado",
+	EMAIL_ALREADY_VERIFIED: "El correo electrónico ya está verificado",
+	EMAIL_MISMATCH: "Los correos electrónicos no coinciden",
+	SESSION_NOT_FRESH: "La sesión no es reciente",
+	LINKED_ACCOUNT_ALREADY_EXISTS: "La cuenta vinculada ya existe",
+	VALIDATION_ERROR: "Error de validación",
+	MISSING_FIELD: "Este campo es requerido",
+	PASSWORD_ALREADY_SET: "El usuario ya tiene una contraseña establecida",
+};
diff --git a/packages/i18n/src/locales/fa.ts b/packages/i18n/src/locales/fa.ts
new file mode 100644
index 0000000000..31759c2010
--- /dev/null
+++ b/packages/i18n/src/locales/fa.ts
@@ -0,0 +1,44 @@
+import type { TranslationDictionary } from "../types";
+
+/**
+ * Persian (Farsi) translations
+ */
+export const fa: TranslationDictionary = {
+	USER_NOT_FOUND: "کاربر یافت نشد",
+	FAILED_TO_CREATE_USER: "ایجاد کاربر ناموفق بود",
+	FAILED_TO_CREATE_SESSION: "ایجاد نشست ناموفق بود",
+	FAILED_TO_UPDATE_USER: "به‌روزرسانی کاربر ناموفق بود",
+	FAILED_TO_GET_SESSION: "دریافت نشست ناموفق بود",
+	INVALID_PASSWORD: "رمز عبور نامعتبر است",
+	INVALID_EMAIL: "ایمیل نامعتبر است",
+	INVALID_EMAIL_OR_PASSWORD: "ایمیل یا رمز عبور نامعتبر است",
+	INVALID_USER: "کاربر نامعتبر است",
+	SOCIAL_ACCOUNT_ALREADY_LINKED: "حساب اجتماعی قبلاً لینک شده است",
+	PROVIDER_NOT_FOUND: "ارائه‌دهنده یافت نشد",
+	INVALID_TOKEN: "توکن نامعتبر است",
+	TOKEN_EXPIRED: "توکن منقضی شده است",
+	FAILED_TO_GET_USER_INFO: "دریافت اطلاعات کاربر ناموفق بود",
+	USER_EMAIL_NOT_FOUND: "ایمیل کاربر یافت نشد",
+	EMAIL_NOT_VERIFIED: "ایمیل تأیید نشده است",
+	PASSWORD_TOO_SHORT: "رمز عبور خیلی کوتاه است",
+	PASSWORD_TOO_LONG: "رمز عبور خیلی طولانی است",
+	USER_ALREADY_EXISTS: "کاربر از قبل وجود دارد",
+	USER_ALREADY_EXISTS_USE_ANOTHER_EMAIL:
+		"کاربر از قبل وجود دارد. از ایمیل دیگری استفاده کنید.",
+	EMAIL_CAN_NOT_BE_UPDATED: "ایمیل قابل به‌روزرسانی نیست",
+	CREDENTIAL_ACCOUNT_NOT_FOUND: "حساب اعتبارنامه یافت نشد",
+	SESSION_EXPIRED:
+		"نشست منقضی شده است. برای انجام این عملیات مجدداً احراز هویت کنید.",
+	FAILED_TO_UNLINK_LAST_ACCOUNT: "نمی‌توانید آخرین حساب خود را جدا کنید",
+	ACCOUNT_NOT_FOUND: "حساب یافت نشد",
+	USER_ALREADY_HAS_PASSWORD:
+		"کاربر از قبل رمز عبور دارد. برای حذف حساب آن را وارد کنید.",
+	VERIFICATION_EMAIL_NOT_ENABLED: "ایمیل تأییدیه فعال نیست",
+	EMAIL_ALREADY_VERIFIED: "ایمیل قبلاً تأیید شده است",
+	EMAIL_MISMATCH: "ایمیل‌ها مطابقت ندارند",
+	SESSION_NOT_FRESH: "نشست تازه نیست",
+	LINKED_ACCOUNT_ALREADY_EXISTS: "حساب لینک شده از قبل وجود دارد",
+	VALIDATION_ERROR: "خطای اعتبارسنجی",
+	MISSING_FIELD: "این فیلد الزامی است",
+	PASSWORD_ALREADY_SET: "کاربر از قبل رمز عبور دارد",
+};
diff --git a/packages/i18n/src/locales/fr.ts b/packages/i18n/src/locales/fr.ts
new file mode 100644
index 0000000000..b18c1fcff0
--- /dev/null
+++ b/packages/i18n/src/locales/fr.ts
@@ -0,0 +1,46 @@
+import type { TranslationDictionary } from "../types";
+
+/**
+ * French translations
+ */
+export const fr: TranslationDictionary = {
+	USER_NOT_FOUND: "Utilisateur non trouvé",
+	FAILED_TO_CREATE_USER: "Échec de la création de l'utilisateur",
+	FAILED_TO_CREATE_SESSION: "Échec de la création de la session",
+	FAILED_TO_UPDATE_USER: "Échec de la mise à jour de l'utilisateur",
+	FAILED_TO_GET_SESSION: "Échec de la récupération de la session",
+	INVALID_PASSWORD: "Mot de passe invalide",
+	INVALID_EMAIL: "Adresse e-mail invalide",
+	INVALID_EMAIL_OR_PASSWORD: "Email ou mot de passe invalide",
+	INVALID_USER: "Utilisateur invalide",
+	SOCIAL_ACCOUNT_ALREADY_LINKED: "Compte social déjà lié",
+	PROVIDER_NOT_FOUND: "Fournisseur non trouvé",
+	INVALID_TOKEN: "Jeton invalide",
+	TOKEN_EXPIRED: "Jeton expiré",
+	FAILED_TO_GET_USER_INFO:
+		"Échec de la récupération des informations utilisateur",
+	USER_EMAIL_NOT_FOUND: "Adresse e-mail de l'utilisateur non trouvée",
+	EMAIL_NOT_VERIFIED: "Adresse e-mail non vérifiée",
+	PASSWORD_TOO_SHORT: "Mot de passe trop court",
+	PASSWORD_TOO_LONG: "Mot de passe trop long",
+	USER_ALREADY_EXISTS: "L'utilisateur existe déjà",
+	USER_ALREADY_EXISTS_USE_ANOTHER_EMAIL:
+		"L'utilisateur existe déjà. Utilisez une autre adresse e-mail.",
+	EMAIL_CAN_NOT_BE_UPDATED: "L'adresse e-mail ne peut pas être mise à jour",
+	CREDENTIAL_ACCOUNT_NOT_FOUND: "Compte de connexion non trouvé",
+	SESSION_EXPIRED:
+		"Session expirée. Veuillez vous reconnecter pour effectuer cette action.",
+	FAILED_TO_UNLINK_LAST_ACCOUNT:
+		"Vous ne pouvez pas dissocier votre dernier compte",
+	ACCOUNT_NOT_FOUND: "Compte non trouvé",
+	USER_ALREADY_HAS_PASSWORD:
+		"L'utilisateur a déjà un mot de passe. Fournissez-le pour supprimer le compte.",
+	VERIFICATION_EMAIL_NOT_ENABLED: "L'e-mail de vérification n'est pas activé",
+	EMAIL_ALREADY_VERIFIED: "L'adresse e-mail est déjà vérifiée",
+	EMAIL_MISMATCH: "Discordance d'adresses e-mail",
+	SESSION_NOT_FRESH: "La session n'est pas récente",
+	LINKED_ACCOUNT_ALREADY_EXISTS: "Le compte lié existe déjà",
+	VALIDATION_ERROR: "Erreur de validation",
+	MISSING_FIELD: "Ce champ est requis",
+	PASSWORD_ALREADY_SET: "L'utilisateur a déjà un mot de passe défini",
+};
diff --git a/packages/i18n/src/locales/hi.ts b/packages/i18n/src/locales/hi.ts
new file mode 100644
index 0000000000..2637ae9037
--- /dev/null
+++ b/packages/i18n/src/locales/hi.ts
@@ -0,0 +1,45 @@
+import type { TranslationDictionary } from "../types";
+
+/**
+ * Hindi translations
+ */
+export const hi: TranslationDictionary = {
+	USER_NOT_FOUND: "उपयोगकर्ता नहीं मिला",
+	FAILED_TO_CREATE_USER: "उपयोगकर्ता बनाने में विफल",
+	FAILED_TO_CREATE_SESSION: "सत्र बनाने में विफल",
+	FAILED_TO_UPDATE_USER: "उपयोगकर्ता अपडेट करने में विफल",
+	FAILED_TO_GET_SESSION: "सत्र प्राप्त करने में विफल",
+	INVALID_PASSWORD: "अमान्य पासवर्ड",
+	INVALID_EMAIL: "अमान्य ईमेल",
+	INVALID_EMAIL_OR_PASSWORD: "अमान्य ईमेल या पासवर्ड",
+	INVALID_USER: "अमान्य उपयोगकर्ता",
+	SOCIAL_ACCOUNT_ALREADY_LINKED: "सोशल अकाउंट पहले से लिंक है",
+	PROVIDER_NOT_FOUND: "प्रदाता नहीं मिला",
+	INVALID_TOKEN: "अमान्य टोकन",
+	TOKEN_EXPIRED: "टोकन समाप्त हो गया",
+	FAILED_TO_GET_USER_INFO: "उपयोगकर्ता जानकारी प्राप्त करने में विफल",
+	USER_EMAIL_NOT_FOUND: "उपयोगकर्ता का ईमेल नहीं मिला",
+	EMAIL_NOT_VERIFIED: "ईमेल सत्यापित नहीं है",
+	PASSWORD_TOO_SHORT: "पासवर्ड बहुत छोटा है",
+	PASSWORD_TOO_LONG: "पासवर्ड बहुत लंबा है",
+	USER_ALREADY_EXISTS: "उपयोगकर्ता पहले से मौजूद है",
+	USER_ALREADY_EXISTS_USE_ANOTHER_EMAIL:
+		"उपयोगकर्ता पहले से मौजूद है। कोई अन्य ईमेल उपयोग करें।",
+	EMAIL_CAN_NOT_BE_UPDATED: "ईमेल अपडेट नहीं किया जा सकता",
+	CREDENTIAL_ACCOUNT_NOT_FOUND: "क्रेडेंशियल अकाउंट नहीं मिला",
+	SESSION_EXPIRED:
+		"सत्र समाप्त हो गया। इस क्रिया को करने के लिए पुनः प्रमाणित करें।",
+	FAILED_TO_UNLINK_LAST_ACCOUNT:
+		"आप अपने अंतिम अकाउंट को अनलिंक नहीं कर सकते",
+	ACCOUNT_NOT_FOUND: "अकाउंट नहीं मिला",
+	USER_ALREADY_HAS_PASSWORD:
+		"उपयोगकर्ता के पास पहले से पासवर्ड है। अकाउंट हटाने के लिए वह दर्ज करें।",
+	VERIFICATION_EMAIL_NOT_ENABLED: "सत्यापन ईमेल सक्षम नहीं है",
+	EMAIL_ALREADY_VERIFIED: "ईमेल पहले से सत्यापित है",
+	EMAIL_MISMATCH: "ईमेल मेल नहीं खाता",
+	SESSION_NOT_FRESH: "सत्र ताजा नहीं है",
+	LINKED_ACCOUNT_ALREADY_EXISTS: "लिंक किया गया अकाउंट पहले से मौजूद है",
+	VALIDATION_ERROR: "सत्यापन त्रुटि",
+	MISSING_FIELD: "यह फ़ील्ड आवश्यक है",
+	PASSWORD_ALREADY_SET: "उपयोगकर्ता का पासवर्ड पहले से सेट है",
+};
diff --git a/packages/i18n/src/locales/id.ts b/packages/i18n/src/locales/id.ts
new file mode 100644
index 0000000000..dafac690cb
--- /dev/null
+++ b/packages/i18n/src/locales/id.ts
@@ -0,0 +1,45 @@
+import type { TranslationDictionary } from "../types";
+
+/**
+ * Indonesian translations
+ */
+export const id: TranslationDictionary = {
+	USER_NOT_FOUND: "Pengguna tidak ditemukan",
+	FAILED_TO_CREATE_USER: "Gagal membuat pengguna",
+	FAILED_TO_CREATE_SESSION: "Gagal membuat sesi",
+	FAILED_TO_UPDATE_USER: "Gagal memperbarui pengguna",
+	FAILED_TO_GET_SESSION: "Gagal mendapatkan sesi",
+	INVALID_PASSWORD: "Kata sandi tidak valid",
+	INVALID_EMAIL: "Alamat email tidak valid",
+	INVALID_EMAIL_OR_PASSWORD: "Email atau kata sandi tidak valid",
+	INVALID_USER: "Pengguna tidak valid",
+	SOCIAL_ACCOUNT_ALREADY_LINKED: "Akun sosial sudah ditautkan",
+	PROVIDER_NOT_FOUND: "Penyedia tidak ditemukan",
+	INVALID_TOKEN: "Token tidak valid",
+	TOKEN_EXPIRED: "Token sudah kedaluwarsa",
+	FAILED_TO_GET_USER_INFO: "Gagal mendapatkan informasi pengguna",
+	USER_EMAIL_NOT_FOUND: "Email pengguna tidak ditemukan",
+	EMAIL_NOT_VERIFIED: "Email belum diverifikasi",
+	PASSWORD_TOO_SHORT: "Kata sandi terlalu pendek",
+	PASSWORD_TOO_LONG: "Kata sandi terlalu panjang",
+	USER_ALREADY_EXISTS: "Pengguna sudah ada",
+	USER_ALREADY_EXISTS_USE_ANOTHER_EMAIL:
+		"Pengguna sudah ada. Gunakan email lain.",
+	EMAIL_CAN_NOT_BE_UPDATED: "Email tidak dapat diperbarui",
+	CREDENTIAL_ACCOUNT_NOT_FOUND: "Akun kredensial tidak ditemukan",
+	SESSION_EXPIRED:
+		"Sesi telah kedaluwarsa. Autentikasi ulang untuk melakukan tindakan ini.",
+	FAILED_TO_UNLINK_LAST_ACCOUNT:
+		"Anda tidak dapat memutuskan tautan akun terakhir Anda",
+	ACCOUNT_NOT_FOUND: "Akun tidak ditemukan",
+	USER_ALREADY_HAS_PASSWORD:
+		"Pengguna sudah memiliki kata sandi. Berikan kata sandi tersebut untuk menghapus akun.",
+	VERIFICATION_EMAIL_NOT_ENABLED: "Email verifikasi tidak diaktifkan",
+	EMAIL_ALREADY_VERIFIED: "Email sudah diverifikasi",
+	EMAIL_MISMATCH: "Email tidak cocok",
+	SESSION_NOT_FRESH: "Sesi tidak segar",
+	LINKED_ACCOUNT_ALREADY_EXISTS: "Akun yang ditautkan sudah ada",
+	VALIDATION_ERROR: "Kesalahan validasi",
+	MISSING_FIELD: "Kolom ini diperlukan",
+	PASSWORD_ALREADY_SET: "Pengguna sudah memiliki kata sandi yang ditetapkan",
+};
diff --git a/packages/i18n/src/locales/index.ts b/packages/i18n/src/locales/index.ts
new file mode 100644
index 0000000000..98ac6bbf23
--- /dev/null
+++ b/packages/i18n/src/locales/index.ts
@@ -0,0 +1,76 @@
+/**
+ * Built-in default translations for the i18n plugin.
+ *
+ * Each locale exports a {@link TranslationDictionary} covering the core
+ * Better Auth error codes. Additional locales can be added by following the
+ * same pattern.
+ *
+ * @example Basic usage — enable all built-in locales
+ * ```ts
+ * import { i18n, locales } from "@better-auth/i18n";
+ *
+ * export const auth = betterAuth({
+ *   plugins: [
+ *     i18n({ translations: locales }),
+ *   ],
+ * });
+ * ```
+ *
+ * @example Selective usage — only a subset of locales
+ * ```ts
+ * import { i18n, locales } from "@better-auth/i18n";
+ *
+ * export const auth = betterAuth({
+ *   plugins: [
+ *     i18n({
+ *       translations: {
+ *         en: locales.en,
+ *         fr: locales.fr,
+ *       },
+ *     }),
+ *   ],
+ * });
+ * ```
+ *
+ * @example Override specific messages for a locale
+ * ```ts
+ * import { i18n, locales } from "@better-auth/i18n";
+ *
+ * export const auth = betterAuth({
+ *   plugins: [
+ *     i18n({
+ *       translations: {
+ *         ...locales,
+ *         fr: {
+ *           ...locales.fr,
+ *           USER_NOT_FOUND: "Membre introuvable",
+ *         },
+ *       },
+ *     }),
+ *   ],
+ * });
+ * ```
+ */
+
+export { ar } from "./ar";
+export { bn } from "./bn";
+export { de } from "./de";
+export { en } from "./en";
+export { es } from "./es";
+export { fa } from "./fa";
+export { fr } from "./fr";
+export { hi } from "./hi";
+export { id } from "./id";
+export { it } from "./it";
+export { ja } from "./ja";
+export { ko } from "./ko";
+export { nl } from "./nl";
+export { pl } from "./pl";
+export { pt } from "./pt";
+export { ru } from "./ru";
+export { sv } from "./sv";
+export { th } from "./th";
+export { tr } from "./tr";
+export { uk } from "./uk";
+export { vi } from "./vi";
+export { zh } from "./zh";
diff --git a/packages/i18n/src/locales/it.ts b/packages/i18n/src/locales/it.ts
new file mode 100644
index 0000000000..8887e887e8
--- /dev/null
+++ b/packages/i18n/src/locales/it.ts
@@ -0,0 +1,46 @@
+import type { TranslationDictionary } from "../types";
+
+/**
+ * Italian translations
+ */
+export const it: TranslationDictionary = {
+	USER_NOT_FOUND: "Utente non trovato",
+	FAILED_TO_CREATE_USER: "Impossibile creare l'utente",
+	FAILED_TO_CREATE_SESSION: "Impossibile creare la sessione",
+	FAILED_TO_UPDATE_USER: "Impossibile aggiornare l'utente",
+	FAILED_TO_GET_SESSION: "Impossibile ottenere la sessione",
+	INVALID_PASSWORD: "Password non valida",
+	INVALID_EMAIL: "Indirizzo e-mail non valido",
+	INVALID_EMAIL_OR_PASSWORD: "Indirizzo e-mail o password non validi",
+	INVALID_USER: "Utente non valido",
+	SOCIAL_ACCOUNT_ALREADY_LINKED: "Account social già collegato",
+	PROVIDER_NOT_FOUND: "Provider non trovato",
+	INVALID_TOKEN: "Token non valido",
+	TOKEN_EXPIRED: "Token scaduto",
+	FAILED_TO_GET_USER_INFO:
+		"Impossibile ottenere le informazioni dell'utente",
+	USER_EMAIL_NOT_FOUND: "Indirizzo e-mail dell'utente non trovato",
+	EMAIL_NOT_VERIFIED: "Indirizzo e-mail non verificato",
+	PASSWORD_TOO_SHORT: "Password troppo corta",
+	PASSWORD_TOO_LONG: "Password troppo lunga",
+	USER_ALREADY_EXISTS: "L'utente esiste già",
+	USER_ALREADY_EXISTS_USE_ANOTHER_EMAIL:
+		"L'utente esiste già. Usa un altro indirizzo e-mail.",
+	EMAIL_CAN_NOT_BE_UPDATED: "L'indirizzo e-mail non può essere aggiornato",
+	CREDENTIAL_ACCOUNT_NOT_FOUND: "Account delle credenziali non trovato",
+	SESSION_EXPIRED:
+		"Sessione scaduta. Esegui nuovamente l'autenticazione per eseguire questa azione.",
+	FAILED_TO_UNLINK_LAST_ACCOUNT:
+		"Non puoi scollegare il tuo ultimo account",
+	ACCOUNT_NOT_FOUND: "Account non trovato",
+	USER_ALREADY_HAS_PASSWORD:
+		"L'utente ha già una password. Forniscila per eliminare l'account.",
+	VERIFICATION_EMAIL_NOT_ENABLED: "L'e-mail di verifica non è abilitata",
+	EMAIL_ALREADY_VERIFIED: "L'indirizzo e-mail è già verificato",
+	EMAIL_MISMATCH: "Gli indirizzi e-mail non corrispondono",
+	SESSION_NOT_FRESH: "La sessione non è recente",
+	LINKED_ACCOUNT_ALREADY_EXISTS: "L'account collegato esiste già",
+	VALIDATION_ERROR: "Errore di validazione",
+	MISSING_FIELD: "Questo campo è obbligatorio",
+	PASSWORD_ALREADY_SET: "L'utente ha già una password impostata",
+};
diff --git a/packages/i18n/src/locales/ja.ts b/packages/i18n/src/locales/ja.ts
new file mode 100644
index 0000000000..79d72d587b
--- /dev/null
+++ b/packages/i18n/src/locales/ja.ts
@@ -0,0 +1,45 @@
+import type { TranslationDictionary } from "../types";
+
+/**
+ * Japanese translations
+ */
+export const ja: TranslationDictionary = {
+	USER_NOT_FOUND: "ユーザーが見つかりません",
+	FAILED_TO_CREATE_USER: "ユーザーの作成に失敗しました",
+	FAILED_TO_CREATE_SESSION: "セッションの作成に失敗しました",
+	FAILED_TO_UPDATE_USER: "ユーザーの更新に失敗しました",
+	FAILED_TO_GET_SESSION: "セッションの取得に失敗しました",
+	INVALID_PASSWORD: "パスワードが無効です",
+	INVALID_EMAIL: "メールアドレスが無効です",
+	INVALID_EMAIL_OR_PASSWORD: "メールアドレスまたはパスワードが無効です",
+	INVALID_USER: "ユーザーが無効です",
+	SOCIAL_ACCOUNT_ALREADY_LINKED: "ソーシャルアカウントはすでに連携されています",
+	PROVIDER_NOT_FOUND: "プロバイダーが見つかりません",
+	INVALID_TOKEN: "トークンが無効です",
+	TOKEN_EXPIRED: "トークンの有効期限が切れています",
+	FAILED_TO_GET_USER_INFO: "ユーザー情報の取得に失敗しました",
+	USER_EMAIL_NOT_FOUND: "ユーザーのメールアドレスが見つかりません",
+	EMAIL_NOT_VERIFIED: "メールアドレスが確認されていません",
+	PASSWORD_TOO_SHORT: "パスワードが短すぎます",
+	PASSWORD_TOO_LONG: "パスワードが長すぎます",
+	USER_ALREADY_EXISTS: "ユーザーはすでに存在します",
+	USER_ALREADY_EXISTS_USE_ANOTHER_EMAIL:
+		"ユーザーはすでに存在します。別のメールアドレスをご使用ください。",
+	EMAIL_CAN_NOT_BE_UPDATED: "メールアドレスは更新できません",
+	CREDENTIAL_ACCOUNT_NOT_FOUND: "認証アカウントが見つかりません",
+	SESSION_EXPIRED:
+		"セッションの有効期限が切れています。このアクションを実行するには再認証してください。",
+	FAILED_TO_UNLINK_LAST_ACCOUNT:
+		"最後のアカウントの連携を解除することはできません",
+	ACCOUNT_NOT_FOUND: "アカウントが見つかりません",
+	USER_ALREADY_HAS_PASSWORD:
+		"ユーザーにはすでにパスワードが設定されています。アカウントを削除するにはパスワードを入力してください。",
+	VERIFICATION_EMAIL_NOT_ENABLED: "確認メールが有効化されていません",
+	EMAIL_ALREADY_VERIFIED: "メールアドレスはすでに確認済みです",
+	EMAIL_MISMATCH: "メールアドレスが一致しません",
+	SESSION_NOT_FRESH: "セッションが最新ではありません",
+	LINKED_ACCOUNT_ALREADY_EXISTS: "連携アカウントはすでに存在します",
+	VALIDATION_ERROR: "バリデーションエラー",
+	MISSING_FIELD: "このフィールドは必須です",
+	PASSWORD_ALREADY_SET: "ユーザーにはすでにパスワードが設定されています",
+};
diff --git a/packages/i18n/src/locales/ko.ts b/packages/i18n/src/locales/ko.ts
new file mode 100644
index 0000000000..026e9007a3
--- /dev/null
+++ b/packages/i18n/src/locales/ko.ts
@@ -0,0 +1,44 @@
+import type { TranslationDictionary } from "../types";
+
+/**
+ * Korean translations
+ */
+export const ko: TranslationDictionary = {
+	USER_NOT_FOUND: "사용자를 찾을 수 없습니다",
+	FAILED_TO_CREATE_USER: "사용자 생성에 실패했습니다",
+	FAILED_TO_CREATE_SESSION: "세션 생성에 실패했습니다",
+	FAILED_TO_UPDATE_USER: "사용자 업데이트에 실패했습니다",
+	FAILED_TO_GET_SESSION: "세션을 가져오는 데 실패했습니다",
+	INVALID_PASSWORD: "유효하지 않은 비밀번호",
+	INVALID_EMAIL: "유효하지 않은 이메일",
+	INVALID_EMAIL_OR_PASSWORD: "유효하지 않은 이메일 또는 비밀번호",
+	INVALID_USER: "유효하지 않은 사용자",
+	SOCIAL_ACCOUNT_ALREADY_LINKED: "소셜 계정이 이미 연결되어 있습니다",
+	PROVIDER_NOT_FOUND: "제공자를 찾을 수 없습니다",
+	INVALID_TOKEN: "유효하지 않은 토큰",
+	TOKEN_EXPIRED: "토큰이 만료되었습니다",
+	FAILED_TO_GET_USER_INFO: "사용자 정보를 가져오는 데 실패했습니다",
+	USER_EMAIL_NOT_FOUND: "사용자 이메일을 찾을 수 없습니다",
+	EMAIL_NOT_VERIFIED: "이메일이 인증되지 않았습니다",
+	PASSWORD_TOO_SHORT: "비밀번호가 너무 짧습니다",
+	PASSWORD_TOO_LONG: "비밀번호가 너무 깁니다",
+	USER_ALREADY_EXISTS: "사용자가 이미 존재합니다",
+	USER_ALREADY_EXISTS_USE_ANOTHER_EMAIL:
+		"사용자가 이미 존재합니다. 다른 이메일을 사용해 주세요.",
+	EMAIL_CAN_NOT_BE_UPDATED: "이메일을 업데이트할 수 없습니다",
+	CREDENTIAL_ACCOUNT_NOT_FOUND: "자격 증명 계정을 찾을 수 없습니다",
+	SESSION_EXPIRED:
+		"세션이 만료되었습니다. 이 작업을 수행하려면 다시 인증해 주세요.",
+	FAILED_TO_UNLINK_LAST_ACCOUNT: "마지막 계정의 연결을 해제할 수 없습니다",
+	ACCOUNT_NOT_FOUND: "계정을 찾을 수 없습니다",
+	USER_ALREADY_HAS_PASSWORD:
+		"사용자에게 이미 비밀번호가 있습니다. 계정을 삭제하려면 비밀번호를 제공해 주세요.",
+	VERIFICATION_EMAIL_NOT_ENABLED: "인증 이메일이 활성화되지 않았습니다",
+	EMAIL_ALREADY_VERIFIED: "이메일이 이미 인증되었습니다",
+	EMAIL_MISMATCH: "이메일이 일치하지 않습니다",
+	SESSION_NOT_FRESH: "세션이 최신 상태가 아닙니다",
+	LINKED_ACCOUNT_ALREADY_EXISTS: "연결된 계정이 이미 존재합니다",
+	VALIDATION_ERROR: "유효성 검사 오류",
+	MISSING_FIELD: "이 필드는 필수입니다",
+	PASSWORD_ALREADY_SET: "사용자에게 이미 비밀번호가 설정되어 있습니다",
+};
diff --git a/packages/i18n/src/locales/nl.ts b/packages/i18n/src/locales/nl.ts
new file mode 100644
index 0000000000..ef1c9b3388
--- /dev/null
+++ b/packages/i18n/src/locales/nl.ts
@@ -0,0 +1,44 @@
+import type { TranslationDictionary } from "../types";
+
+/**
+ * Dutch translations
+ */
+export const nl: TranslationDictionary = {
+	USER_NOT_FOUND: "Gebruiker niet gevonden",
+	FAILED_TO_CREATE_USER: "Gebruiker aanmaken mislukt",
+	FAILED_TO_CREATE_SESSION: "Sessie aanmaken mislukt",
+	FAILED_TO_UPDATE_USER: "Gebruiker bijwerken mislukt",
+	FAILED_TO_GET_SESSION: "Sessie ophalen mislukt",
+	INVALID_PASSWORD: "Ongeldig wachtwoord",
+	INVALID_EMAIL: "Ongeldig e-mailadres",
+	INVALID_EMAIL_OR_PASSWORD: "Ongeldig e-mailadres of wachtwoord",
+	INVALID_USER: "Ongeldige gebruiker",
+	SOCIAL_ACCOUNT_ALREADY_LINKED: "Sociaal account al gekoppeld",
+	PROVIDER_NOT_FOUND: "Provider niet gevonden",
+	INVALID_TOKEN: "Ongeldig token",
+	TOKEN_EXPIRED: "Token verlopen",
+	FAILED_TO_GET_USER_INFO: "Gebruikersinformatie ophalen mislukt",
+	USER_EMAIL_NOT_FOUND: "E-mailadres van gebruiker niet gevonden",
+	EMAIL_NOT_VERIFIED: "E-mailadres niet geverifieerd",
+	PASSWORD_TOO_SHORT: "Wachtwoord te kort",
+	PASSWORD_TOO_LONG: "Wachtwoord te lang",
+	USER_ALREADY_EXISTS: "Gebruiker bestaat al",
+	USER_ALREADY_EXISTS_USE_ANOTHER_EMAIL:
+		"Gebruiker bestaat al. Gebruik een ander e-mailadres.",
+	EMAIL_CAN_NOT_BE_UPDATED: "E-mailadres kan niet worden bijgewerkt",
+	CREDENTIAL_ACCOUNT_NOT_FOUND: "Referentieaccount niet gevonden",
+	SESSION_EXPIRED:
+		"Sessie verlopen. Authenticeer opnieuw om deze actie uit te voeren.",
+	FAILED_TO_UNLINK_LAST_ACCOUNT: "U kunt uw laatste account niet ontkoppelen",
+	ACCOUNT_NOT_FOUND: "Account niet gevonden",
+	USER_ALREADY_HAS_PASSWORD:
+		"Gebruiker heeft al een wachtwoord. Geef dit op om het account te verwijderen.",
+	VERIFICATION_EMAIL_NOT_ENABLED: "Verificatie-e-mail is niet ingeschakeld",
+	EMAIL_ALREADY_VERIFIED: "E-mailadres is al geverifieerd",
+	EMAIL_MISMATCH: "E-mailadressen komen niet overeen",
+	SESSION_NOT_FRESH: "Sessie is niet actueel",
+	LINKED_ACCOUNT_ALREADY_EXISTS: "Gekoppeld account bestaat al",
+	VALIDATION_ERROR: "Validatiefout",
+	MISSING_FIELD: "Dit veld is verplicht",
+	PASSWORD_ALREADY_SET: "Gebruiker heeft al een wachtwoord ingesteld",
+};
diff --git a/packages/i18n/src/locales/pl.ts b/packages/i18n/src/locales/pl.ts
new file mode 100644
index 0000000000..d2bfc06238
--- /dev/null
+++ b/packages/i18n/src/locales/pl.ts
@@ -0,0 +1,47 @@
+import type { TranslationDictionary } from "../types";
+
+/**
+ * Polish translations
+ */
+export const pl: TranslationDictionary = {
+	USER_NOT_FOUND: "Użytkownik nie znaleziony",
+	FAILED_TO_CREATE_USER: "Nie udało się utworzyć użytkownika",
+	FAILED_TO_CREATE_SESSION: "Nie udało się utworzyć sesji",
+	FAILED_TO_UPDATE_USER: "Nie udało się zaktualizować użytkownika",
+	FAILED_TO_GET_SESSION: "Nie udało się pobrać sesji",
+	INVALID_PASSWORD: "Nieprawidłowe hasło",
+	INVALID_EMAIL: "Nieprawidłowy adres e-mail",
+	INVALID_EMAIL_OR_PASSWORD: "Nieprawidłowy adres e-mail lub hasło",
+	INVALID_USER: "Nieprawidłowy użytkownik",
+	SOCIAL_ACCOUNT_ALREADY_LINKED: "Konto społecznościowe jest już połączone",
+	PROVIDER_NOT_FOUND: "Dostawca nie znaleziony",
+	INVALID_TOKEN: "Nieprawidłowy token",
+	TOKEN_EXPIRED: "Token wygasł",
+	FAILED_TO_GET_USER_INFO:
+		"Nie udało się pobrać informacji o użytkowniku",
+	USER_EMAIL_NOT_FOUND: "Adres e-mail użytkownika nie znaleziony",
+	EMAIL_NOT_VERIFIED: "Adres e-mail nie został zweryfikowany",
+	PASSWORD_TOO_SHORT: "Hasło jest za krótkie",
+	PASSWORD_TOO_LONG: "Hasło jest za długie",
+	USER_ALREADY_EXISTS: "Użytkownik już istnieje",
+	USER_ALREADY_EXISTS_USE_ANOTHER_EMAIL:
+		"Użytkownik już istnieje. Użyj innego adresu e-mail.",
+	EMAIL_CAN_NOT_BE_UPDATED: "Adres e-mail nie może zostać zaktualizowany",
+	CREDENTIAL_ACCOUNT_NOT_FOUND:
+		"Konto z danymi uwierzytelniającymi nie znalezione",
+	SESSION_EXPIRED:
+		"Sesja wygasła. Uwierzytelnij się ponownie, aby wykonać tę akcję.",
+	FAILED_TO_UNLINK_LAST_ACCOUNT:
+		"Nie możesz odłączyć swojego ostatniego konta",
+	ACCOUNT_NOT_FOUND: "Konto nie znalezione",
+	USER_ALREADY_HAS_PASSWORD:
+		"Użytkownik ma już hasło. Podaj je, aby usunąć konto.",
+	VERIFICATION_EMAIL_NOT_ENABLED: "E-mail weryfikacyjny nie jest włączony",
+	EMAIL_ALREADY_VERIFIED: "Adres e-mail jest już zweryfikowany",
+	EMAIL_MISMATCH: "Adresy e-mail nie są zgodne",
+	SESSION_NOT_FRESH: "Sesja nie jest aktualna",
+	LINKED_ACCOUNT_ALREADY_EXISTS: "Połączone konto już istnieje",
+	VALIDATION_ERROR: "Błąd walidacji",
+	MISSING_FIELD: "To pole jest wymagane",
+	PASSWORD_ALREADY_SET: "Użytkownik ma już ustawione hasło",
+};
diff --git a/packages/i18n/src/locales/pt.ts b/packages/i18n/src/locales/pt.ts
new file mode 100644
index 0000000000..86013e9ee5
--- /dev/null
+++ b/packages/i18n/src/locales/pt.ts
@@ -0,0 +1,45 @@
+import type { TranslationDictionary } from "../types";
+
+/**
+ * Portuguese translations
+ */
+export const pt: TranslationDictionary = {
+	USER_NOT_FOUND: "Usuário não encontrado",
+	FAILED_TO_CREATE_USER: "Falha ao criar usuário",
+	FAILED_TO_CREATE_SESSION: "Falha ao criar sessão",
+	FAILED_TO_UPDATE_USER: "Falha ao atualizar usuário",
+	FAILED_TO_GET_SESSION: "Falha ao obter sessão",
+	INVALID_PASSWORD: "Senha inválida",
+	INVALID_EMAIL: "E-mail inválido",
+	INVALID_EMAIL_OR_PASSWORD: "E-mail ou senha inválidos",
+	INVALID_USER: "Usuário inválido",
+	SOCIAL_ACCOUNT_ALREADY_LINKED: "Conta social já vinculada",
+	PROVIDER_NOT_FOUND: "Provedor não encontrado",
+	INVALID_TOKEN: "Token inválido",
+	TOKEN_EXPIRED: "Token expirado",
+	FAILED_TO_GET_USER_INFO: "Falha ao obter informações do usuário",
+	USER_EMAIL_NOT_FOUND: "E-mail do usuário não encontrado",
+	EMAIL_NOT_VERIFIED: "E-mail não verificado",
+	PASSWORD_TOO_SHORT: "Senha muito curta",
+	PASSWORD_TOO_LONG: "Senha muito longa",
+	USER_ALREADY_EXISTS: "Usuário já existe",
+	USER_ALREADY_EXISTS_USE_ANOTHER_EMAIL:
+		"Usuário já existe. Use outro e-mail.",
+	EMAIL_CAN_NOT_BE_UPDATED: "O e-mail não pode ser atualizado",
+	CREDENTIAL_ACCOUNT_NOT_FOUND: "Conta de credencial não encontrada",
+	SESSION_EXPIRED:
+		"Sessão expirada. Autentique-se novamente para realizar esta ação.",
+	FAILED_TO_UNLINK_LAST_ACCOUNT:
+		"Você não pode desvincular sua última conta",
+	ACCOUNT_NOT_FOUND: "Conta não encontrada",
+	USER_ALREADY_HAS_PASSWORD:
+		"Usuário já tem uma senha. Forneça-a para excluir a conta.",
+	VERIFICATION_EMAIL_NOT_ENABLED: "E-mail de verificação não está habilitado",
+	EMAIL_ALREADY_VERIFIED: "E-mail já está verificado",
+	EMAIL_MISMATCH: "E-mails não correspondem",
+	SESSION_NOT_FRESH: "Sessão não está recente",
+	LINKED_ACCOUNT_ALREADY_EXISTS: "Conta vinculada já existe",
+	VALIDATION_ERROR: "Erro de validação",
+	MISSING_FIELD: "Este campo é obrigatório",
+	PASSWORD_ALREADY_SET: "Usuário já tem uma senha definida",
+};
diff --git a/packages/i18n/src/locales/ru.ts b/packages/i18n/src/locales/ru.ts
new file mode 100644
index 0000000000..632125d220
--- /dev/null
+++ b/packages/i18n/src/locales/ru.ts
@@ -0,0 +1,45 @@
+import type { TranslationDictionary } from "../types";
+
+/**
+ * Russian translations
+ */
+export const ru: TranslationDictionary = {
+	USER_NOT_FOUND: "Пользователь не найден",
+	FAILED_TO_CREATE_USER: "Не удалось создать пользователя",
+	FAILED_TO_CREATE_SESSION: "Не удалось создать сессию",
+	FAILED_TO_UPDATE_USER: "Не удалось обновить пользователя",
+	FAILED_TO_GET_SESSION: "Не удалось получить сессию",
+	INVALID_PASSWORD: "Неверный пароль",
+	INVALID_EMAIL: "Недействительный адрес электронной почты",
+	INVALID_EMAIL_OR_PASSWORD: "Неверный адрес электронной почты или пароль",
+	INVALID_USER: "Недействительный пользователь",
+	SOCIAL_ACCOUNT_ALREADY_LINKED: "Аккаунт в социальной сети уже привязан",
+	PROVIDER_NOT_FOUND: "Провайдер не найден",
+	INVALID_TOKEN: "Недействительный токен",
+	TOKEN_EXPIRED: "Токен истёк",
+	FAILED_TO_GET_USER_INFO:
+		"Не удалось получить информацию о пользователе",
+	USER_EMAIL_NOT_FOUND: "Электронная почта пользователя не найдена",
+	EMAIL_NOT_VERIFIED: "Электронная почта не подтверждена",
+	PASSWORD_TOO_SHORT: "Пароль слишком короткий",
+	PASSWORD_TOO_LONG: "Пароль слишком длинный",
+	USER_ALREADY_EXISTS: "Пользователь уже существует",
+	USER_ALREADY_EXISTS_USE_ANOTHER_EMAIL:
+		"Пользователь уже существует. Используйте другой адрес электронной почты.",
+	EMAIL_CAN_NOT_BE_UPDATED: "Адрес электронной почты не может быть обновлён",
+	CREDENTIAL_ACCOUNT_NOT_FOUND: "Учётная запись с паролем не найдена",
+	SESSION_EXPIRED:
+		"Сессия истекла. Выполните повторную аутентификацию для выполнения этого действия.",
+	FAILED_TO_UNLINK_LAST_ACCOUNT: "Вы не можете отвязать последний аккаунт",
+	ACCOUNT_NOT_FOUND: "Аккаунт не найден",
+	USER_ALREADY_HAS_PASSWORD:
+		"У пользователя уже есть пароль. Укажите его для удаления аккаунта.",
+	VERIFICATION_EMAIL_NOT_ENABLED: "Письмо для подтверждения не включено",
+	EMAIL_ALREADY_VERIFIED: "Электронная почта уже подтверждена",
+	EMAIL_MISMATCH: "Адреса электронной почты не совпадают",
+	SESSION_NOT_FRESH: "Сессия устарела",
+	LINKED_ACCOUNT_ALREADY_EXISTS: "Привязанный аккаунт уже существует",
+	VALIDATION_ERROR: "Ошибка валидации",
+	MISSING_FIELD: "Это поле обязательно для заполнения",
+	PASSWORD_ALREADY_SET: "У пользователя уже установлен пароль",
+};
diff --git a/packages/i18n/src/locales/sv.ts b/packages/i18n/src/locales/sv.ts
new file mode 100644
index 0000000000..5af70f96df
--- /dev/null
+++ b/packages/i18n/src/locales/sv.ts
@@ -0,0 +1,46 @@
+import type { TranslationDictionary } from "../types";
+
+/**
+ * Swedish translations
+ */
+export const sv: TranslationDictionary = {
+	USER_NOT_FOUND: "Användare hittades inte",
+	FAILED_TO_CREATE_USER: "Misslyckades med att skapa användare",
+	FAILED_TO_CREATE_SESSION: "Misslyckades med att skapa session",
+	FAILED_TO_UPDATE_USER: "Misslyckades med att uppdatera användare",
+	FAILED_TO_GET_SESSION: "Misslyckades med att hämta session",
+	INVALID_PASSWORD: "Ogiltigt lösenord",
+	INVALID_EMAIL: "Ogiltig e-postadress",
+	INVALID_EMAIL_OR_PASSWORD: "Ogiltig e-postadress eller lösenord",
+	INVALID_USER: "Ogiltig användare",
+	SOCIAL_ACCOUNT_ALREADY_LINKED: "Socialt konto redan länkat",
+	PROVIDER_NOT_FOUND: "Leverantör hittades inte",
+	INVALID_TOKEN: "Ogiltigt token",
+	TOKEN_EXPIRED: "Token har gått ut",
+	FAILED_TO_GET_USER_INFO:
+		"Misslyckades med att hämta användarinformation",
+	USER_EMAIL_NOT_FOUND: "Användarens e-postadress hittades inte",
+	EMAIL_NOT_VERIFIED: "E-postadressen är inte verifierad",
+	PASSWORD_TOO_SHORT: "Lösenordet är för kort",
+	PASSWORD_TOO_LONG: "Lösenordet är för långt",
+	USER_ALREADY_EXISTS: "Användaren finns redan",
+	USER_ALREADY_EXISTS_USE_ANOTHER_EMAIL:
+		"Användaren finns redan. Använd en annan e-postadress.",
+	EMAIL_CAN_NOT_BE_UPDATED: "E-postadressen kan inte uppdateras",
+	CREDENTIAL_ACCOUNT_NOT_FOUND: "Inloggningskontot hittades inte",
+	SESSION_EXPIRED:
+		"Sessionen har gått ut. Autentisera dig igen för att utföra denna åtgärd.",
+	FAILED_TO_UNLINK_LAST_ACCOUNT:
+		"Du kan inte ta bort länken till ditt sista konto",
+	ACCOUNT_NOT_FOUND: "Kontot hittades inte",
+	USER_ALREADY_HAS_PASSWORD:
+		"Användaren har redan ett lösenord. Ange det för att ta bort kontot.",
+	VERIFICATION_EMAIL_NOT_ENABLED: "Verifieringsmail är inte aktiverat",
+	EMAIL_ALREADY_VERIFIED: "E-postadressen är redan verifierad",
+	EMAIL_MISMATCH: "E-postadresserna stämmer inte överens",
+	SESSION_NOT_FRESH: "Sessionen är inte aktuell",
+	LINKED_ACCOUNT_ALREADY_EXISTS: "Det länkade kontot finns redan",
+	VALIDATION_ERROR: "Valideringsfel",
+	MISSING_FIELD: "Det här fältet är obligatoriskt",
+	PASSWORD_ALREADY_SET: "Användaren har redan ett lösenord inställt",
+};
diff --git a/packages/i18n/src/locales/th.ts b/packages/i18n/src/locales/th.ts
new file mode 100644
index 0000000000..754bc0ba1f
--- /dev/null
+++ b/packages/i18n/src/locales/th.ts
@@ -0,0 +1,45 @@
+import type { TranslationDictionary } from "../types";
+
+/**
+ * Thai translations
+ */
+export const th: TranslationDictionary = {
+	USER_NOT_FOUND: "ไม่พบผู้ใช้",
+	FAILED_TO_CREATE_USER: "สร้างผู้ใช้ไม่สำเร็จ",
+	FAILED_TO_CREATE_SESSION: "สร้างเซสชันไม่สำเร็จ",
+	FAILED_TO_UPDATE_USER: "อัปเดตผู้ใช้ไม่สำเร็จ",
+	FAILED_TO_GET_SESSION: "ดึงเซสชันไม่สำเร็จ",
+	INVALID_PASSWORD: "รหัสผ่านไม่ถูกต้อง",
+	INVALID_EMAIL: "อีเมลไม่ถูกต้อง",
+	INVALID_EMAIL_OR_PASSWORD: "อีเมลหรือรหัสผ่านไม่ถูกต้อง",
+	INVALID_USER: "ผู้ใช้ไม่ถูกต้อง",
+	SOCIAL_ACCOUNT_ALREADY_LINKED: "บัญชีโซเชียลเชื่อมต่อแล้ว",
+	PROVIDER_NOT_FOUND: "ไม่พบผู้ให้บริการ",
+	INVALID_TOKEN: "โทเคนไม่ถูกต้อง",
+	TOKEN_EXPIRED: "โทเคนหมดอายุ",
+	FAILED_TO_GET_USER_INFO: "ดึงข้อมูลผู้ใช้ไม่สำเร็จ",
+	USER_EMAIL_NOT_FOUND: "ไม่พบอีเมลผู้ใช้",
+	EMAIL_NOT_VERIFIED: "อีเมลยังไม่ได้รับการยืนยัน",
+	PASSWORD_TOO_SHORT: "รหัสผ่านสั้นเกินไป",
+	PASSWORD_TOO_LONG: "รหัสผ่านยาวเกินไป",
+	USER_ALREADY_EXISTS: "ผู้ใช้มีอยู่แล้ว",
+	USER_ALREADY_EXISTS_USE_ANOTHER_EMAIL:
+		"ผู้ใช้มีอยู่แล้ว กรุณาใช้อีเมลอื่น",
+	EMAIL_CAN_NOT_BE_UPDATED: "ไม่สามารถอัปเดตอีเมลได้",
+	CREDENTIAL_ACCOUNT_NOT_FOUND: "ไม่พบบัญชีข้อมูลรับรอง",
+	SESSION_EXPIRED:
+		"เซสชันหมดอายุ กรุณายืนยันตัวตนใหม่เพื่อดำเนินการนี้",
+	FAILED_TO_UNLINK_LAST_ACCOUNT:
+		"คุณไม่สามารถยกเลิกการเชื่อมต่อบัญชีสุดท้ายของคุณได้",
+	ACCOUNT_NOT_FOUND: "ไม่พบบัญชี",
+	USER_ALREADY_HAS_PASSWORD:
+		"ผู้ใช้มีรหัสผ่านอยู่แล้ว กรุณาระบุรหัสผ่านเพื่อลบบัญชี",
+	VERIFICATION_EMAIL_NOT_ENABLED: "ไม่ได้เปิดใช้งานอีเมลยืนยัน",
+	EMAIL_ALREADY_VERIFIED: "อีเมลได้รับการยืนยันแล้ว",
+	EMAIL_MISMATCH: "อีเมลไม่ตรงกัน",
+	SESSION_NOT_FRESH: "เซสชันไม่ใหม่",
+	LINKED_ACCOUNT_ALREADY_EXISTS: "บัญชีที่เชื่อมต่อมีอยู่แล้ว",
+	VALIDATION_ERROR: "ข้อผิดพลาดในการตรวจสอบ",
+	MISSING_FIELD: "ต้องกรอกฟิลด์นี้",
+	PASSWORD_ALREADY_SET: "ผู้ใช้มีรหัสผ่านที่ตั้งค่าไว้แล้ว",
+};
diff --git a/packages/i18n/src/locales/tr.ts b/packages/i18n/src/locales/tr.ts
new file mode 100644
index 0000000000..4836aa7ce1
--- /dev/null
+++ b/packages/i18n/src/locales/tr.ts
@@ -0,0 +1,45 @@
+import type { TranslationDictionary } from "../types";
+
+/**
+ * Turkish translations
+ */
+export const tr: TranslationDictionary = {
+	USER_NOT_FOUND: "Kullanıcı bulunamadı",
+	FAILED_TO_CREATE_USER: "Kullanıcı oluşturulamadı",
+	FAILED_TO_CREATE_SESSION: "Oturum oluşturulamadı",
+	FAILED_TO_UPDATE_USER: "Kullanıcı güncellenemedi",
+	FAILED_TO_GET_SESSION: "Oturum alınamadı",
+	INVALID_PASSWORD: "Geçersiz şifre",
+	INVALID_EMAIL: "Geçersiz e-posta adresi",
+	INVALID_EMAIL_OR_PASSWORD: "Geçersiz e-posta adresi veya şifre",
+	INVALID_USER: "Geçersiz kullanıcı",
+	SOCIAL_ACCOUNT_ALREADY_LINKED: "Sosyal hesap zaten bağlı",
+	PROVIDER_NOT_FOUND: "Sağlayıcı bulunamadı",
+	INVALID_TOKEN: "Geçersiz token",
+	TOKEN_EXPIRED: "Token süresi doldu",
+	FAILED_TO_GET_USER_INFO: "Kullanıcı bilgileri alınamadı",
+	USER_EMAIL_NOT_FOUND: "Kullanıcı e-posta adresi bulunamadı",
+	EMAIL_NOT_VERIFIED: "E-posta adresi doğrulanmadı",
+	PASSWORD_TOO_SHORT: "Şifre çok kısa",
+	PASSWORD_TOO_LONG: "Şifre çok uzun",
+	USER_ALREADY_EXISTS: "Kullanıcı zaten mevcut",
+	USER_ALREADY_EXISTS_USE_ANOTHER_EMAIL:
+		"Kullanıcı zaten mevcut. Başka bir e-posta adresi kullanın.",
+	EMAIL_CAN_NOT_BE_UPDATED: "E-posta adresi güncellenemiyor",
+	CREDENTIAL_ACCOUNT_NOT_FOUND: "Kimlik bilgisi hesabı bulunamadı",
+	SESSION_EXPIRED:
+		"Oturum süresi doldu. Bu işlemi gerçekleştirmek için yeniden kimlik doğrulayın.",
+	FAILED_TO_UNLINK_LAST_ACCOUNT:
+		"Son hesabınızın bağlantısını kaldıramazsınız",
+	ACCOUNT_NOT_FOUND: "Hesap bulunamadı",
+	USER_ALREADY_HAS_PASSWORD:
+		"Kullanıcının zaten bir şifresi var. Hesabı silmek için şifreyi girin.",
+	VERIFICATION_EMAIL_NOT_ENABLED: "Doğrulama e-postası etkin değil",
+	EMAIL_ALREADY_VERIFIED: "E-posta adresi zaten doğrulandı",
+	EMAIL_MISMATCH: "E-posta adresleri uyuşmuyor",
+	SESSION_NOT_FRESH: "Oturum güncel değil",
+	LINKED_ACCOUNT_ALREADY_EXISTS: "Bağlı hesap zaten mevcut",
+	VALIDATION_ERROR: "Doğrulama hatası",
+	MISSING_FIELD: "Bu alan gerekli",
+	PASSWORD_ALREADY_SET: "Kullanıcının şifresi zaten ayarlanmış",
+};
diff --git a/packages/i18n/src/locales/uk.ts b/packages/i18n/src/locales/uk.ts
new file mode 100644
index 0000000000..0b9715642f
--- /dev/null
+++ b/packages/i18n/src/locales/uk.ts
@@ -0,0 +1,47 @@
+import type { TranslationDictionary } from "../types";
+
+/**
+ * Ukrainian translations
+ */
+export const uk: TranslationDictionary = {
+	USER_NOT_FOUND: "Користувача не знайдено",
+	FAILED_TO_CREATE_USER: "Не вдалося створити користувача",
+	FAILED_TO_CREATE_SESSION: "Не вдалося створити сеанс",
+	FAILED_TO_UPDATE_USER: "Не вдалося оновити користувача",
+	FAILED_TO_GET_SESSION: "Не вдалося отримати сеанс",
+	INVALID_PASSWORD: "Неправильний пароль",
+	INVALID_EMAIL: "Недійсна адреса електронної пошти",
+	INVALID_EMAIL_OR_PASSWORD:
+		"Неправильна адреса електронної пошти або пароль",
+	INVALID_USER: "Недійсний користувач",
+	SOCIAL_ACCOUNT_ALREADY_LINKED: "Соціальний акаунт вже прив'язано",
+	PROVIDER_NOT_FOUND: "Провайдера не знайдено",
+	INVALID_TOKEN: "Недійсний токен",
+	TOKEN_EXPIRED: "Термін дії токена закінчився",
+	FAILED_TO_GET_USER_INFO:
+		"Не вдалося отримати інформацію про користувача",
+	USER_EMAIL_NOT_FOUND: "Адресу електронної пошти користувача не знайдено",
+	EMAIL_NOT_VERIFIED: "Адресу електронної пошти не підтверджено",
+	PASSWORD_TOO_SHORT: "Пароль занадто короткий",
+	PASSWORD_TOO_LONG: "Пароль занадто довгий",
+	USER_ALREADY_EXISTS: "Користувач вже існує",
+	USER_ALREADY_EXISTS_USE_ANOTHER_EMAIL:
+		"Користувач вже існує. Використовуйте іншу адресу електронної пошти.",
+	EMAIL_CAN_NOT_BE_UPDATED:
+		"Адресу електронної пошти не можна оновити",
+	CREDENTIAL_ACCOUNT_NOT_FOUND: "Обліковий запис із даними не знайдено",
+	SESSION_EXPIRED:
+		"Сеанс закінчився. Пройдіть повторну аутентифікацію для виконання цієї дії.",
+	FAILED_TO_UNLINK_LAST_ACCOUNT: "Ви не можете від'єднати останній акаунт",
+	ACCOUNT_NOT_FOUND: "Акаунт не знайдено",
+	USER_ALREADY_HAS_PASSWORD:
+		"Користувач вже має пароль. Вкажіть його, щоб видалити акаунт.",
+	VERIFICATION_EMAIL_NOT_ENABLED: "Лист для підтвердження не увімкнено",
+	EMAIL_ALREADY_VERIFIED: "Адресу електронної пошти вже підтверджено",
+	EMAIL_MISMATCH: "Адреси електронної пошти не збігаються",
+	SESSION_NOT_FRESH: "Сеанс не є актуальним",
+	LINKED_ACCOUNT_ALREADY_EXISTS: "Прив'язаний акаунт вже існує",
+	VALIDATION_ERROR: "Помилка валідації",
+	MISSING_FIELD: "Це поле є обов'язковим",
+	PASSWORD_ALREADY_SET: "У користувача вже встановлено пароль",
+};
diff --git a/packages/i18n/src/locales/vi.ts b/packages/i18n/src/locales/vi.ts
new file mode 100644
index 0000000000..52a208f6c6
--- /dev/null
+++ b/packages/i18n/src/locales/vi.ts
@@ -0,0 +1,46 @@
+import type { TranslationDictionary } from "../types";
+
+/**
+ * Vietnamese translations
+ */
+export const vi: TranslationDictionary = {
+	USER_NOT_FOUND: "Không tìm thấy người dùng",
+	FAILED_TO_CREATE_USER: "Tạo người dùng thất bại",
+	FAILED_TO_CREATE_SESSION: "Tạo phiên thất bại",
+	FAILED_TO_UPDATE_USER: "Cập nhật người dùng thất bại",
+	FAILED_TO_GET_SESSION: "Lấy phiên thất bại",
+	INVALID_PASSWORD: "Mật khẩu không hợp lệ",
+	INVALID_EMAIL: "Email không hợp lệ",
+	INVALID_EMAIL_OR_PASSWORD: "Email hoặc mật khẩu không hợp lệ",
+	INVALID_USER: "Người dùng không hợp lệ",
+	SOCIAL_ACCOUNT_ALREADY_LINKED: "Tài khoản mạng xã hội đã được liên kết",
+	PROVIDER_NOT_FOUND: "Không tìm thấy nhà cung cấp",
+	INVALID_TOKEN: "Token không hợp lệ",
+	TOKEN_EXPIRED: "Token đã hết hạn",
+	FAILED_TO_GET_USER_INFO: "Lấy thông tin người dùng thất bại",
+	USER_EMAIL_NOT_FOUND: "Không tìm thấy email người dùng",
+	EMAIL_NOT_VERIFIED: "Email chưa được xác minh",
+	PASSWORD_TOO_SHORT: "Mật khẩu quá ngắn",
+	PASSWORD_TOO_LONG: "Mật khẩu quá dài",
+	USER_ALREADY_EXISTS: "Người dùng đã tồn tại",
+	USER_ALREADY_EXISTS_USE_ANOTHER_EMAIL:
+		"Người dùng đã tồn tại. Sử dụng email khác.",
+	EMAIL_CAN_NOT_BE_UPDATED: "Email không thể được cập nhật",
+	CREDENTIAL_ACCOUNT_NOT_FOUND:
+		"Không tìm thấy tài khoản thông tin xác thực",
+	SESSION_EXPIRED:
+		"Phiên đã hết hạn. Xác thực lại để thực hiện hành động này.",
+	FAILED_TO_UNLINK_LAST_ACCOUNT:
+		"Bạn không thể hủy liên kết tài khoản cuối cùng của mình",
+	ACCOUNT_NOT_FOUND: "Không tìm thấy tài khoản",
+	USER_ALREADY_HAS_PASSWORD:
+		"Người dùng đã có mật khẩu. Cung cấp mật khẩu để xóa tài khoản.",
+	VERIFICATION_EMAIL_NOT_ENABLED: "Email xác minh chưa được bật",
+	EMAIL_ALREADY_VERIFIED: "Email đã được xác minh",
+	EMAIL_MISMATCH: "Email không khớp",
+	SESSION_NOT_FRESH: "Phiên không còn mới",
+	LINKED_ACCOUNT_ALREADY_EXISTS: "Tài khoản được liên kết đã tồn tại",
+	VALIDATION_ERROR: "Lỗi xác thực",
+	MISSING_FIELD: "Trường này là bắt buộc",
+	PASSWORD_ALREADY_SET: "Người dùng đã có mật khẩu được đặt",
+};
diff --git a/packages/i18n/src/locales/zh.ts b/packages/i18n/src/locales/zh.ts
new file mode 100644
index 0000000000..5647fe3c3a
--- /dev/null
+++ b/packages/i18n/src/locales/zh.ts
@@ -0,0 +1,41 @@
+import type { TranslationDictionary } from "../types";
+
+/**
+ * Simplified Chinese translations
+ */
+export const zh: TranslationDictionary = {
+	USER_NOT_FOUND: "用户未找到",
+	FAILED_TO_CREATE_USER: "创建用户失败",
+	FAILED_TO_CREATE_SESSION: "创建会话失败",
+	FAILED_TO_UPDATE_USER: "更新用户失败",
+	FAILED_TO_GET_SESSION: "获取会话失败",
+	INVALID_PASSWORD: "密码无效",
+	INVALID_EMAIL: "邮箱无效",
+	INVALID_EMAIL_OR_PASSWORD: "邮箱或密码无效",
+	INVALID_USER: "用户无效",
+	SOCIAL_ACCOUNT_ALREADY_LINKED: "社交账户已绑定",
+	PROVIDER_NOT_FOUND: "提供商未找到",
+	INVALID_TOKEN: "令牌无效",
+	TOKEN_EXPIRED: "令牌已过期",
+	FAILED_TO_GET_USER_INFO: "获取用户信息失败",
+	USER_EMAIL_NOT_FOUND: "用户邮箱未找到",
+	EMAIL_NOT_VERIFIED: "邮箱未验证",
+	PASSWORD_TOO_SHORT: "密码太短",
+	PASSWORD_TOO_LONG: "密码太长",
+	USER_ALREADY_EXISTS: "用户已存在",
+	USER_ALREADY_EXISTS_USE_ANOTHER_EMAIL: "用户已存在，请使用其他邮箱",
+	EMAIL_CAN_NOT_BE_UPDATED: "邮箱无法更新",
+	CREDENTIAL_ACCOUNT_NOT_FOUND: "凭证账户未找到",
+	SESSION_EXPIRED: "会话已过期，请重新验证身份以执行此操作",
+	FAILED_TO_UNLINK_LAST_ACCOUNT: "无法取消绑定最后一个账户",
+	ACCOUNT_NOT_FOUND: "账户未找到",
+	USER_ALREADY_HAS_PASSWORD: "用户已设置密码，请提供密码以删除账户",
+	VERIFICATION_EMAIL_NOT_ENABLED: "验证邮件未启用",
+	EMAIL_ALREADY_VERIFIED: "邮箱已验证",
+	EMAIL_MISMATCH: "邮箱不匹配",
+	SESSION_NOT_FRESH: "会话已过时",
+	LINKED_ACCOUNT_ALREADY_EXISTS: "已绑定账户已存在",
+	VALIDATION_ERROR: "验证错误",
+	MISSING_FIELD: "此字段为必填项",
+	PASSWORD_ALREADY_SET: "用户已设置密码",
+};
diff --git a/packages/i18n/tsdown.config.ts b/packages/i18n/tsdown.config.ts
index a52367369a..90fc4ce37e 100644
--- a/packages/i18n/tsdown.config.ts
+++ b/packages/i18n/tsdown.config.ts
@@ -3,6 +3,6 @@ import { defineConfig } from "tsdown";
 export default defineConfig({
 	dts: { build: true, incremental: true },
 	format: ["esm"],
-	entry: ["./src/index.ts", "./src/client.ts"],
+	entry: ["./src/index.ts", "./src/client.ts", "./src/locales/index.ts"],
 	treeshake: true,
 });