diff --git a/src/app/auth/forgot-password.tsx b/src/app/auth/forgot-password.tsx
index 94c0c44..2de4b03 100644
--- a/src/app/auth/forgot-password.tsx
+++ b/src/app/auth/forgot-password.tsx
@@ -9,6 +9,7 @@ import { apiAuthCaptcha, apiUserRequestPasswordReset } from "@/client/api";
 import type { ResetPasswordParams } from "@/client/model";
 import { getCaptcha } from "@/lib/auth-crypto";
 import { AUTH_FORM } from "@/css/auth/styles";
+import { t } from "@/i18n/T";
 
 export function ForgotPasswordPage() {
   const [error, setError] = useState<string>("");
@@ -24,7 +25,7 @@ export function ForgotPasswordPage() {
       const result = await getCaptcha(apiAuthCaptcha, true);
       setCaptchaImage(result.base64);
     } catch {
-      setError("Failed to load captcha");
+      setError(t("auth.login.error.failed_to_load_captcha"));
     }
   };
 
@@ -38,7 +39,7 @@ export function ForgotPasswordPage() {
     setSuccess(false);
 
     if (data.captcha !== captchaText) {
-      setError("Captcha verification failed");
+      setError(t("auth.forgot_password.captcha_failed"));
       loadCaptcha();
       setLoading(false);
       return;
@@ -50,7 +51,7 @@ export function ForgotPasswordPage() {
       setSuccess(true);
     } catch (err) {
       const apiErr = err as { response?: { status?: number; data?: { message?: string } } };
-      setError(apiErr.response?.data?.message || "Failed to send reset email");
+      setError(apiErr.response?.data?.message || t("auth.forgot_password.send_failed"));
     } finally {
       setLoading(false);
     }
@@ -61,8 +62,8 @@ export function ForgotPasswordPage() {
       <div className={AUTH_FORM.card}>
         <div className={AUTH_FORM.cardBg}>
           <div className={AUTH_FORM.header}>
-            <h2 className={AUTH_FORM.title}>Reset your password</h2>
-            <p className={AUTH_FORM.subtitle}>Enter your email and we'll send you a reset link</p>
+            <h2 className={AUTH_FORM.title}>{t("auth.forgot_password.title")}</h2>
+            <p className={AUTH_FORM.subtitle}>{t("auth.forgot_password.subtitle")}</p>
           </div>
 
           <form onSubmit={handleSubmit(onSubmit)} className={AUTH_FORM.form}>
@@ -75,23 +76,23 @@ export function ForgotPasswordPage() {
             {success && (
               <Alert style={{ backgroundColor: "var(--surface-elevated)", borderColor: "var(--success)" }} className="text-[var(--success)] dark:text-[var(--success)]">
                 <AlertDescription>
-                  If an account exists with that email, you will receive a password reset link shortly.
+                  {t("auth.forgot_password.success_message")}
                 </AlertDescription>
               </Alert>
             )}
 
             <div className={AUTH_FORM.inputGroup}>
               <Label htmlFor="email" className={AUTH_FORM.inputLabel}>
-                Email <span className={AUTH_FORM.inputLabelAccent}>*</span>
+                {t("auth.register.email")} <span className={AUTH_FORM.inputLabelAccent}>*</span>
               </Label>
               <Input
                 id="email"
                 type="email"
                 {...register("email", {
-                  required: "Email is required",
-                  pattern: { value: /^[^\s@]+@[^\s@]+\.[^\s@]+$/, message: "Invalid email address" }
+                  required: t("auth.register.email_required"),
+                  pattern: { value: /^[^\s@]+@[^\s@]+\.[^\s@]+$/, message: t("auth.register.email_invalid") }
                 })}
-                placeholder="Enter your email"
+                placeholder={t("auth.forgot_password.email_placeholder")}
                 disabled={loading || success}
                 className={AUTH_FORM.input}
               />
@@ -102,13 +103,13 @@ export function ForgotPasswordPage() {
 
             <div className={AUTH_FORM.inputGroup}>
               <Label htmlFor="captcha" className={AUTH_FORM.inputLabel}>
-                Verification <span className={AUTH_FORM.inputLabelAccent}>*</span>
+                {t("auth.login.verification")} <span className={AUTH_FORM.inputLabelAccent}>*</span>
               </Label>
               <div className="flex gap-2">
                 <Input
                   id="captcha"
-                  {...register("captcha", { required: "Captcha is required" })}
-                  placeholder="Enter code"
+                  {...register("captcha", { required: t("auth.login.captcha_required") })}
+                  placeholder={t("auth.login.captcha_placeholder")}
                   disabled={loading || success}
                   className={AUTH_FORM.input}
                   onChange={(e) => setCaptchaText(e.target.value)}
@@ -119,7 +120,7 @@ export function ForgotPasswordPage() {
                     alt="Captcha"
                     className={AUTH_FORM.captchaImg}
                     onClick={loadCaptcha}
-                    title="Click to refresh"
+                    title={t("auth.login.captcha_title")}
                   />
                 )}
               </div>
@@ -133,12 +134,12 @@ export function ForgotPasswordPage() {
               className={AUTH_FORM.submitBtn}
               disabled={loading || success}
             >
-              {loading ? "Sending..." : "Send Reset Link"}
+              {loading ? t("auth.forgot_password.sending") : t("auth.forgot_password.submit")}
             </Button>
 
             <div className={AUTH_FORM.linkTextCenter}>
               <Link to="/auth/login" className={AUTH_FORM.link}>
-                Back to login
+                {t("auth.forgot_password.back_to_login")}
               </Link>
             </div>
           </form>
diff --git a/src/app/auth/login.tsx b/src/app/auth/login.tsx
index 2162333..9e35583 100644
--- a/src/app/auth/login.tsx
+++ b/src/app/auth/login.tsx
@@ -10,6 +10,7 @@ import { useLoginMutation } from "@/hooks/useAuth";
 import type { LoginParams } from "@/client/model";
 import { getCaptcha, encryptPassword } from "@/lib/auth-crypto";
 import { AUTH_FORM } from "@/css/auth/styles";
+import { t } from "@/i18n/T";
 
 export function LoginPage() {
   const navigate = useNavigate();
@@ -28,7 +29,7 @@ export function LoginPage() {
       setCaptchaImage(result.base64);
       setPublicKey(result.publicKey || "");
     } catch {
-      setError("Failed to load captcha");
+      setError(t("auth.login.error.failed_to_load_captcha"));
     }
   };
 
@@ -56,11 +57,11 @@ export function LoginPage() {
       const apiErr = err as { response?: { status?: number; data?: { message?: string } } };
       if (apiErr.response?.status === 428) {
         setNeeds2FA(true);
-        setError("Two-factor authentication required");
+        setError(t("auth.login.error.two_factor_required"));
       } else if (apiErr.response?.status === 401) {
-        setError("Invalid username or password");
+        setError(t("auth.login.error.invalid_credentials"));
       } else {
-        setError(apiErr.response?.data?.message || "Login failed");
+        setError(apiErr.response?.data?.message || t("auth.login.error.login_failed"));
       }
       loadCaptcha();
     }
@@ -73,8 +74,8 @@ export function LoginPage() {
       <div className={AUTH_FORM.card}>
         <div className={AUTH_FORM.cardBg}>
           <div className={AUTH_FORM.header}>
-            <h2 className={AUTH_FORM.title}>Welcome back!</h2>
-            <p className={AUTH_FORM.subtitle}>We're so excited to see you again!</p>
+            <h2 className={AUTH_FORM.title}>{t("auth.login.title")}</h2>
+            <p className={AUTH_FORM.subtitle}>{t("auth.login.subtitle")}</p>
           </div>
 
           <form onSubmit={handleSubmit(onSubmit)} className={AUTH_FORM.form}>
@@ -86,12 +87,12 @@ export function LoginPage() {
 
             <div className={AUTH_FORM.inputGroup}>
               <Label htmlFor="username" className={AUTH_FORM.inputLabel}>
-                Account <span className={AUTH_FORM.inputLabelAccent}>*</span>
+                {t("auth.login.account")} <span className={AUTH_FORM.inputLabelAccent}>*</span>
               </Label>
               <Input
                 id="username"
-                {...register("username", { required: "Username is required" })}
-                placeholder="Username or email"
+                {...register("username", { required: t("auth.login.account_required") || "Username is required" })}
+                placeholder={t("auth.login.account_placeholder")}
                 disabled={loading}
                 className={AUTH_FORM.input}
               />
@@ -102,13 +103,13 @@ export function LoginPage() {
 
             <div className={AUTH_FORM.inputGroup}>
               <Label htmlFor="password" className={AUTH_FORM.inputLabel}>
-                Password <span className={AUTH_FORM.inputLabelAccent}>*</span>
+                {t("auth.login.password")} <span className={AUTH_FORM.inputLabelAccent}>*</span>
               </Label>
               <Input
                 id="password"
                 type="password"
-                {...register("password", { required: "Password is required" })}
-                placeholder="Password"
+                {...register("password", { required: t("auth.login.password_required") || "Password is required" })}
+                placeholder={t("auth.login.password")}
                 disabled={loading}
                 className={AUTH_FORM.input}
               />
@@ -119,13 +120,13 @@ export function LoginPage() {
 
             <div className={AUTH_FORM.inputGroup}>
               <Label htmlFor="captcha" className={AUTH_FORM.inputLabel}>
-                Verification <span className={AUTH_FORM.inputLabelAccent}>*</span>
+                {t("auth.login.verification")} <span className={AUTH_FORM.inputLabelAccent}>*</span>
               </Label>
               <div className="flex gap-2">
                 <Input
                   id="captcha"
-                  {...register("captcha", { required: "Captcha is required" })}
-                  placeholder="Enter code"
+                  {...register("captcha", { required: t("auth.login.captcha_required") || "Captcha is required" })}
+                  placeholder={t("auth.login.captcha_placeholder")}
                   disabled={loading}
                   className={AUTH_FORM.input}
                 />
@@ -135,7 +136,7 @@ export function LoginPage() {
                     alt="Captcha"
                     className={AUTH_FORM.captchaImg}
                     onClick={loadCaptcha}
-                    title="Click to refresh"
+                    title={t("auth.login.captcha_title")}
                   />
                 )}
               </div>
@@ -147,12 +148,12 @@ export function LoginPage() {
             {needs2FA && (
               <div className={AUTH_FORM.inputGroup}>
                 <Label htmlFor="totp_code" className={AUTH_FORM.inputLabel}>
-                  2FA Code <span className={AUTH_FORM.inputLabelAccent}>*</span>
+                  {t("auth.login.2fa_code")} <span className={AUTH_FORM.inputLabelAccent}>*</span>
                 </Label>
                 <Input
                   id="totp_code"
                   {...register("totp_code")}
-                  placeholder="6-digit code"
+                  placeholder={t("auth.login.2fa_placeholder")}
                   maxLength={6}
                   disabled={loading}
                   className={`${AUTH_FORM.input} ${AUTH_FORM.inputMono}`}
@@ -161,7 +162,7 @@ export function LoginPage() {
             )}
 
             <Link to="/auth/forgot-password" className={AUTH_FORM.link}>
-              Forgot your password?
+              {t("auth.login.forgot_password")}
             </Link>
 
             <Button
@@ -169,13 +170,13 @@ export function LoginPage() {
               className={AUTH_FORM.submitBtn}
               disabled={loading}
             >
-              {loading ? "Logging in..." : "Log In"}
+              {loading ? t("auth.login.submit_loading") : t("auth.login.submit")}
             </Button>
 
             <div className={AUTH_FORM.linkText}>
-              Need an account?{" "}
+              {t("auth.login.need_account")}{" "}
               <Link to="/auth/register" className={AUTH_FORM.link}>
-                Register
+                {t("auth.login.register")}
               </Link>
             </div>
           </form>
diff --git a/src/app/auth/register.tsx b/src/app/auth/register.tsx
index 896a6b4..c592ae9 100644
--- a/src/app/auth/register.tsx
+++ b/src/app/auth/register.tsx
@@ -9,6 +9,7 @@ import { apiAuthCaptcha, apiAuthRegister } from "@/client/api";
 import type { RegisterParams } from "@/client/model";
 import { getCaptcha, encryptPassword } from "@/lib/auth-crypto";
 import { AUTH_FORM } from "@/css/auth/styles";
+import { t } from "@/i18n/T";
 
 export function RegisterPage() {
   const navigate = useNavigate();
@@ -25,7 +26,7 @@ export function RegisterPage() {
       setCaptchaImage(result.base64);
       setPublicKey(result.publicKey || "");
     } catch {
-      setError("Failed to load captcha");
+      setError(t("auth.login.error.failed_to_load_captcha"));
     }
   };
 
@@ -41,7 +42,7 @@ export function RegisterPage() {
     setError("");
 
     if (data.password !== data.confirmPassword) {
-      setError("Passwords do not match");
+      setError(t("auth.register.passwords_not_match"));
       setLoading(false);
       return;
     }
@@ -60,9 +61,9 @@ export function RegisterPage() {
     } catch (err) {
       const apiErr = err as { response?: { status?: number; data?: { message?: string } } };
       if (apiErr.response?.status === 409) {
-        setError("Username or email already exists");
+        setError(t("auth.register.user_exists"));
       } else {
-        setError(apiErr.response?.data?.message || "Registration failed");
+        setError(apiErr.response?.data?.message || t("auth.register.registration_failed"));
       }
       loadCaptcha();
     } finally {
@@ -75,8 +76,8 @@ export function RegisterPage() {
       <div className={AUTH_FORM.card}>
         <div className={AUTH_FORM.cardBg}>
           <div className={AUTH_FORM.header}>
-            <h2 className={AUTH_FORM.title}>Create an account</h2>
-            <p className={AUTH_FORM.subtitle}>Join us today!</p>
+            <h2 className={AUTH_FORM.title}>{t("auth.register.title")}</h2>
+            <p className={AUTH_FORM.subtitle}>{t("auth.register.subtitle")}</p>
           </div>
 
           <form onSubmit={handleSubmit(onSubmit)} className={AUTH_FORM.form}>
@@ -88,16 +89,16 @@ export function RegisterPage() {
 
             <div className={AUTH_FORM.inputGroup}>
               <Label htmlFor="username" className={AUTH_FORM.inputLabel}>
-                Username <span className={AUTH_FORM.inputLabelAccent}>*</span>
+                {t("auth.register.username")} <span className={AUTH_FORM.inputLabelAccent}>*</span>
               </Label>
               <Input
                 id="username"
                 {...register("username", {
-                  required: "Username is required",
-                  minLength: { value: 3, message: "Username must be at least 3 characters" },
-                  pattern: { value: /^[a-zA-Z0-9_-]+$/, message: "Username can only contain letters, numbers, _ and -" }
+                  required: t("auth.register.username_required"),
+                  minLength: { value: 3, message: t("auth.register.username_min_length") },
+                  pattern: { value: /^[a-zA-Z0-9_-]+$/, message: t("auth.register.username_pattern") }
                 })}
-                placeholder="Choose a username"
+                placeholder={t("auth.register.username_placeholder")}
                 disabled={loading}
                 className={AUTH_FORM.input}
               />
@@ -108,16 +109,16 @@ export function RegisterPage() {
 
             <div className={AUTH_FORM.inputGroup}>
               <Label htmlFor="email" className={AUTH_FORM.inputLabel}>
-                Email <span className={AUTH_FORM.inputLabelAccent}>*</span>
+                {t("auth.register.email")} <span className={AUTH_FORM.inputLabelAccent}>*</span>
               </Label>
               <Input
                 id="email"
                 type="email"
                 {...register("email", {
-                  required: "Email is required",
-                  pattern: { value: /^[^\s@]+@[^\s@]+\.[^\s@]+$/, message: "Invalid email address" }
+                  required: t("auth.register.email_required"),
+                  pattern: { value: /^[^\s@]+@[^\s@]+\.[^\s@]+$/, message: t("auth.register.email_invalid") }
                 })}
-                placeholder="Enter your email"
+                placeholder={t("auth.register.email_placeholder")}
                 disabled={loading}
                 className={AUTH_FORM.input}
               />
@@ -128,16 +129,16 @@ export function RegisterPage() {
 
             <div className={AUTH_FORM.inputGroup}>
               <Label htmlFor="password" className={AUTH_FORM.inputLabel}>
-                Password <span className={AUTH_FORM.inputLabelAccent}>*</span>
+                {t("auth.login.password")} <span className={AUTH_FORM.inputLabelAccent}>*</span>
               </Label>
               <Input
                 id="password"
                 type="password"
                 {...register("password", {
-                  required: "Password is required",
-                  minLength: { value: 8, message: "Password must be at least 8 characters" }
+                  required: t("auth.login.password_required"),
+                  minLength: { value: 8, message: t("auth.register.password_min_length") }
                 })}
-                placeholder="Create a password"
+                placeholder={t("auth.register.password_placeholder")}
                 disabled={loading}
                 className={AUTH_FORM.input}
               />
@@ -148,16 +149,16 @@ export function RegisterPage() {
 
             <div className={AUTH_FORM.inputGroup}>
               <Label htmlFor="confirmPassword" className={AUTH_FORM.inputLabel}>
-                Confirm Password <span className={AUTH_FORM.inputLabelAccent}>*</span>
+                {t("auth.register.confirm_password")} <span className={AUTH_FORM.inputLabelAccent}>*</span>
               </Label>
               <Input
                 id="confirmPassword"
                 type="password"
                 {...register("confirmPassword", {
-                  required: "Please confirm your password",
-                  validate: value => value === password || "Passwords do not match"
+                  required: t("auth.register.confirm_password_required"),
+                  validate: value => value === password || t("auth.register.passwords_not_match")
                 })}
-                placeholder="Confirm your password"
+                placeholder={t("auth.register.confirm_password_placeholder")}
                 disabled={loading}
                 className={AUTH_FORM.input}
               />
@@ -168,13 +169,13 @@ export function RegisterPage() {
 
             <div className={AUTH_FORM.inputGroup}>
               <Label htmlFor="captcha" className={AUTH_FORM.inputLabel}>
-                Verification <span className={AUTH_FORM.inputLabelAccent}>*</span>
+                {t("auth.login.verification")} <span className={AUTH_FORM.inputLabelAccent}>*</span>
               </Label>
               <div className="flex gap-2">
                 <Input
                   id="captcha"
-                  {...register("captcha", { required: "Captcha is required" })}
-                  placeholder="Enter code"
+                  {...register("captcha", { required: t("auth.login.captcha_required") })}
+                  placeholder={t("auth.login.captcha_placeholder")}
                   disabled={loading}
                   className={AUTH_FORM.input}
                 />
@@ -184,7 +185,7 @@ export function RegisterPage() {
                     alt="Captcha"
                     className={AUTH_FORM.captchaImg}
                     onClick={loadCaptcha}
-                    title="Click to refresh"
+                    title={t("auth.login.captcha_title")}
                   />
                 )}
               </div>
@@ -198,13 +199,13 @@ export function RegisterPage() {
               className={AUTH_FORM.submitBtn}
               disabled={loading}
             >
-              {loading ? "Creating account..." : "Create Account"}
+              {loading ? t("auth.register.submit_loading") : t("auth.register.submit")}
             </Button>
 
             <div className={AUTH_FORM.linkText}>
-              Already have an account?{" "}
+              {t("auth.register.already_have_account")}{" "}
               <Link to="/auth/login" className={AUTH_FORM.link}>
-                Login
+                {t("auth.register.login")}
               </Link>
             </div>
           </form>
diff --git a/src/app/auth/reset-password.tsx b/src/app/auth/reset-password.tsx
index 738aaa5..1168c9c 100644
--- a/src/app/auth/reset-password.tsx
+++ b/src/app/auth/reset-password.tsx
@@ -9,6 +9,7 @@ import { apiAuthCaptcha, apiUserConfirmPasswordReset } from "@/client/api";
 import type { ConfirmResetPasswordParams } from "@/client/model";
 import { getCaptcha, encryptPassword } from "@/lib/auth-crypto";
 import { AUTH_FORM } from "@/css/auth/styles";
+import { t } from "@/i18n/T";
 
 export function ResetPasswordPage() {
   const navigate = useNavigate();
@@ -33,7 +34,7 @@ export function ResetPasswordPage() {
       setCaptchaImage(result.base64);
       setPublicKey(result.publicKey || "");
     } catch {
-      setError("Failed to load captcha");
+      setError(t("auth.login.error.failed_to_load_captcha"));
     }
   };
 
@@ -46,7 +47,7 @@ export function ResetPasswordPage() {
     setError("");
 
     if (data.new_password !== data.confirmPassword) {
-      setError("Passwords do not match");
+      setError(t("auth.register.passwords_not_match"));
       setLoading(false);
       return;
     }
@@ -63,9 +64,9 @@ export function ResetPasswordPage() {
     } catch (err) {
       const apiErr = err as { response?: { status?: number; data?: { message?: string } } };
       if (apiErr.response?.status === 400) {
-        setError("Invalid or expired reset token");
+        setError(t("auth.reset_password.invalid_token"));
       } else {
-        setError(apiErr.response?.data?.message || "Failed to reset password");
+        setError(apiErr.response?.data?.message || t("auth.reset_password.reset_failed"));
       }
     } finally {
       setLoading(false);
@@ -77,8 +78,8 @@ export function ResetPasswordPage() {
       <div className={AUTH_FORM.card}>
         <div className={AUTH_FORM.cardBg}>
           <div className={AUTH_FORM.header}>
-            <h2 className={AUTH_FORM.title}>Set new password</h2>
-            <p className={AUTH_FORM.subtitle}>Choose a strong password for your account</p>
+            <h2 className={AUTH_FORM.title}>{t("auth.reset_password.title")}</h2>
+            <p className={AUTH_FORM.subtitle}>{t("auth.reset_password.subtitle")}</p>
           </div>
 
           <form onSubmit={handleSubmit(onSubmit)} className={AUTH_FORM.form}>
@@ -92,16 +93,16 @@ export function ResetPasswordPage() {
 
             <div className={AUTH_FORM.inputGroup}>
               <Label htmlFor="new_password" className={AUTH_FORM.inputLabel}>
-                New Password <span className={AUTH_FORM.inputLabelAccent}>*</span>
+                {t("auth.login.password")} <span className={AUTH_FORM.inputLabelAccent}>*</span>
               </Label>
               <Input
                 id="new_password"
                 type="password"
                 {...register("new_password", {
-                  required: "Password is required",
-                  minLength: { value: 8, message: "Password must be at least 8 characters" }
+                  required: t("auth.login.password_required"),
+                  minLength: { value: 8, message: t("auth.register.password_min_length") }
                 })}
-                placeholder="Enter new password"
+                placeholder={t("auth.reset_password.new_password_placeholder")}
                 disabled={loading}
                 className={AUTH_FORM.input}
               />
@@ -112,16 +113,16 @@ export function ResetPasswordPage() {
 
             <div className={AUTH_FORM.inputGroup}>
               <Label htmlFor="confirmPassword" className={AUTH_FORM.inputLabel}>
-                Confirm Password <span className={AUTH_FORM.inputLabelAccent}>*</span>
+                {t("auth.register.confirm_password")} <span className={AUTH_FORM.inputLabelAccent}>*</span>
               </Label>
               <Input
                 id="confirmPassword"
                 type="password"
                 {...register("confirmPassword", {
-                  required: "Please confirm your password",
-                  validate: value => value === password || "Passwords do not match"
+                  required: t("auth.register.confirm_password_required"),
+                  validate: value => value === password || t("auth.register.passwords_not_match")
                 })}
-                placeholder="Confirm new password"
+                placeholder={t("auth.reset_password.confirm_password_placeholder")}
                 disabled={loading}
                 className={AUTH_FORM.input}
               />
@@ -132,13 +133,13 @@ export function ResetPasswordPage() {
 
             <div className={AUTH_FORM.inputGroup}>
               <Label htmlFor="captcha" className={AUTH_FORM.inputLabel}>
-                Verification <span className={AUTH_FORM.inputLabelAccent}>*</span>
+                {t("auth.login.verification")} <span className={AUTH_FORM.inputLabelAccent}>*</span>
               </Label>
               <div className="flex gap-2">
                 <Input
                   id="captcha"
-                  {...register("captcha", { required: "Captcha is required" })}
-                  placeholder="Enter code"
+                  {...register("captcha", { required: t("auth.login.captcha_required") })}
+                  placeholder={t("auth.login.captcha_placeholder")}
                   disabled={loading}
                   className={AUTH_FORM.input}
                 />
@@ -148,7 +149,7 @@ export function ResetPasswordPage() {
                     alt="Captcha"
                     className={AUTH_FORM.captchaImg}
                     onClick={loadCaptcha}
-                    title="Click to refresh"
+                    title={t("auth.login.captcha_title")}
                   />
                 )}
               </div>
@@ -162,12 +163,12 @@ export function ResetPasswordPage() {
               className={AUTH_FORM.submitBtn}
               disabled={loading}
             >
-              {loading ? "Resetting..." : "Reset Password"}
+              {loading ? t("auth.reset_password.resetting") : t("auth.reset_password.submit")}
             </Button>
 
             <div className={AUTH_FORM.linkTextCenter}>
               <Link to="/auth/login" className={AUTH_FORM.link}>
-                Back to login
+                {t("auth.reset_password.back_to_login")}
               </Link>
             </div>
           </form>
diff --git a/src/app/auth/two-factor.tsx b/src/app/auth/two-factor.tsx
index 75a139a..3c21fc4 100644
--- a/src/app/auth/two-factor.tsx
+++ b/src/app/auth/two-factor.tsx
@@ -9,6 +9,7 @@ import { InputOTP, InputOTPGroup, InputOTPSlot, InputOTPSeparator } from "@/comp
 import { api2faEnable, api2faVerify, api2faDisable, api2faStatus } from "@/client/api";
 import type { Disable2FAParams } from "@/client/model";
 import { AUTH_FORM } from "@/css/auth/styles";
+import { t } from "@/i18n/T";
 
 export function TwoFactorPage() {
   const navigate = useNavigate();
@@ -27,7 +28,7 @@ export function TwoFactorPage() {
       const response = await api2faStatus();
       setIsEnabled(response.data.is_enabled || false);
     } catch {
-      setError("Failed to load 2FA status");
+      setError(t("auth.two_factor.error.load_failed"));
     }
   };
 
@@ -47,7 +48,7 @@ export function TwoFactorPage() {
       setShowSetup(true);
     } catch (err) {
       const apiErr = err as { response?: { status?: number; data?: { message?: string } } };
-      setError(apiErr.response?.data?.message || "Failed to enable 2FA");
+      setError(apiErr.response?.data?.message || t("auth.two_factor.error.enable_failed"));
     } finally {
       setLoading(false);
     }
@@ -67,7 +68,7 @@ export function TwoFactorPage() {
       setSecret("");
     } catch (err) {
       const apiErr = err as { response?: { status?: number; data?: { message?: string } } };
-      setError(apiErr.response?.data?.message || "Invalid verification code");
+      setError(apiErr.response?.data?.message || t("auth.two_factor.error.invalid_code"));
     } finally {
       setLoading(false);
     }
@@ -82,7 +83,7 @@ export function TwoFactorPage() {
       setIsEnabled(false);
     } catch (err) {
       const apiErr = err as { response?: { status?: number; data?: { message?: string } } };
-      setError(apiErr.response?.data?.message || "Failed to disable 2FA");
+      setError(apiErr.response?.data?.message || t("auth.two_factor.error.disable_failed"));
     } finally {
       setLoading(false);
     }
@@ -93,9 +94,9 @@ export function TwoFactorPage() {
       <div className={AUTH_FORM.card}>
         <div className={AUTH_FORM.cardBg}>
           <div className={AUTH_FORM.header}>
-            <h2 className={AUTH_FORM.title}>Two-Factor Authentication</h2>
+            <h2 className={AUTH_FORM.title}>{t("auth.two_factor.title")}</h2>
             <p className={AUTH_FORM.subtitle}>
-              {isEnabled ? "2FA is currently enabled" : "Add an extra layer of security"}
+              {isEnabled ? t("auth.two_factor.enabled") : t("auth.two_factor.disabled")}
             </p>
           </div>
 
@@ -109,15 +110,14 @@ export function TwoFactorPage() {
             {!isEnabled && !showSetup && (
               <div className={AUTH_FORM.form}>
                 <p className={AUTH_FORM.infoText}>
-                  Two-factor authentication adds an additional layer of security to your account by requiring
-                  more than just a password to log in.
+                  {t("auth.two_factor.description")}
                 </p>
                 <Button
                   onClick={handleEnable}
                   disabled={loading}
                   className={AUTH_FORM.submitBtn}
                 >
-                  Enable 2FA
+                  {t("auth.two_factor.enable")}
                 </Button>
               </div>
             )}
@@ -125,14 +125,14 @@ export function TwoFactorPage() {
             {showSetup && (
               <div className={AUTH_FORM.form}>
                 <div className={AUTH_FORM.inputGroup}>
-                  <Label className={AUTH_FORM.inputLabel}>Scan QR Code</Label>
+                  <Label className={AUTH_FORM.inputLabel}>{t("auth.two_factor.scan_qr_code")}</Label>
                   <div className={AUTH_FORM.qrContainer}>
                     <img src={qrCode} alt="QR Code" className={AUTH_FORM.qrImage} />
                   </div>
                 </div>
 
                 <div className={AUTH_FORM.inputGroup}>
-                  <Label className={AUTH_FORM.inputLabel}>Or enter this code manually</Label>
+                  <Label className={AUTH_FORM.inputLabel}>{t("auth.two_factor.or_enter_manually")}</Label>
                   <Input
                     value={secret}
                     readOnly
@@ -141,7 +141,7 @@ export function TwoFactorPage() {
                 </div>
 
                 <div className={AUTH_FORM.inputGroup}>
-                  <Label className={AUTH_FORM.inputLabel}>Verification Code</Label>
+                  <Label className={AUTH_FORM.inputLabel}>{t("auth.two_factor.verification_code")}</Label>
                   <div className="flex justify-center">
                     <InputOTP maxLength={6} onChange={setVerificationCode} disabled={loading}>
                       <InputOTPGroup>
@@ -160,7 +160,7 @@ export function TwoFactorPage() {
                     disabled={loading || verificationCode.length !== 6}
                     className={AUTH_FORM.submitBtn}
                   >
-                    Verify
+                    {t("auth.two_factor.submit")}
                   </Button>
 
                   <Button
@@ -172,7 +172,7 @@ export function TwoFactorPage() {
                     }}
                     className={AUTH_FORM.submitBtnOutline}
                   >
-                    Cancel
+                    {t("auth.two_factor.cancel")}
                   </Button>
                 </div>
               </div>
@@ -182,18 +182,18 @@ export function TwoFactorPage() {
               <form onSubmit={handleSubmit(handleDisable)} className={AUTH_FORM.form}>
                 <Alert className={AUTH_FORM.successAlert}>
                   <AlertDescription>
-                    Two-factor authentication is currently enabled on your account.
+                    {t("auth.two_factor.enabled_message")}
                   </AlertDescription>
                 </Alert>
 
                 <div className={AUTH_FORM.inputGroup}>
                   <Label htmlFor="code" className={AUTH_FORM.inputLabel}>
-                    Verification Code <span className={AUTH_FORM.inputLabelAccent}>*</span>
+                    {t("auth.two_factor.verification_code")} <span className={AUTH_FORM.inputLabelAccent}>*</span>
                   </Label>
                   <Input
                     id="code"
-                    {...register("code", { required: "Code is required" })}
-                    placeholder="Enter 6-digit code"
+                    {...register("code", { required: t("auth.two_factor.code_required") })}
+                    placeholder={t("auth.two_factor.code_placeholder")}
                     maxLength={6}
                     disabled={loading}
                     className={AUTH_FORM.input}
@@ -205,13 +205,13 @@ export function TwoFactorPage() {
 
                 <div className={AUTH_FORM.inputGroup}>
                   <Label htmlFor="password" className={AUTH_FORM.inputLabel}>
-                    Password <span className={AUTH_FORM.inputLabelAccent}>*</span>
+                    {t("auth.login.password")} <span className={AUTH_FORM.inputLabelAccent}>*</span>
                   </Label>
                   <Input
                     id="password"
                     type="password"
-                    {...register("password", { required: "Password is required" })}
-                    placeholder="Enter your password"
+                    {...register("password", { required: t("auth.login.password_required") })}
+                    placeholder={t("auth.two_factor.password_placeholder")}
                     disabled={loading}
                     className={AUTH_FORM.input}
                   />
@@ -226,7 +226,7 @@ export function TwoFactorPage() {
                   disabled={loading}
                   className={AUTH_FORM.submitBtnDestructive}
                 >
-                  {loading ? "Disabling..." : "Disable 2FA"}
+                  {loading ? t("auth.two_factor.disabling") : t("auth.two_factor.disable")}
                 </Button>
               </form>
             )}
@@ -237,7 +237,7 @@ export function TwoFactorPage() {
               className="w-full h-11 transition-colors"
               style={{ color: "var(--text-muted)" }}
             >
-              Back
+              {t("auth.two_factor.back")}
             </Button>
           </div>
         </div>
diff --git a/src/fonts.css b/src/fonts.css
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index 0000000..e69de29
diff --git a/src/i18n/T.tsx b/src/i18n/T.tsx
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index 0000000..e69de29
diff --git a/src/i18n/de.json b/src/i18n/de.json
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diff --git a/src/i18n/en.json b/src/i18n/en.json
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diff --git a/src/i18n/fr.json b/src/i18n/fr.json
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diff --git a/src/i18n/jp.json b/src/i18n/jp.json
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index 0000000..e69de29
diff --git a/src/i18n/zh.json b/src/i18n/zh.json
new file mode 100644
index 0000000..e69de29