diff --git a/devfront/src/components/common/ForbiddenMessage.tsx b/devfront/src/components/common/ForbiddenMessage.tsx
index 97c2af01..43dee424 100644
--- a/devfront/src/components/common/ForbiddenMessage.tsx
+++ b/devfront/src/components/common/ForbiddenMessage.tsx
@@ -14,34 +14,34 @@ export function ForbiddenMessage({ resourceToken }: Props) {
 
   let explanation = t(
     "msg.dev.forbidden.default",
-    "해당 리소스에 접근할 권한이 없습니다. 관리자에게 문의하세요.",
+    "You do not have permission to access this resource. Contact your administrator.",
   );
 
   if (role === "rp_admin") {
     explanation = t(
       "msg.dev.forbidden.rp_admin",
-      "RP 관리자는 담당 앱의 리소스만 조회할 수 있습니다.",
+      "RP administrators can only access resources for their assigned applications.",
     );
   } else if (role === "tenant_admin") {
     explanation = t(
       "msg.dev.forbidden.tenant_admin",
-      "테넌트 관리자 권한이 올바르게 설정되지 않았거나 만료되었습니다.",
+      "Your tenant administrator permission is missing, misconfigured, or expired.",
     );
   } else if (role === "user" || role === "tenant_member") {
     if (resourceToken === "consents") {
       explanation = t(
         "msg.dev.forbidden.user.consents",
-        "해당 앱(RP)에 대한 동의 내역 조회는 'RP 관리자', '동의 조회', '동의 회수' 관계가 부여된 경우에만 사용할 수 있습니다. 권한이 필요하면 관리자에게 요청하세요.",
+        "Viewing consent records for this application requires an RP administrator, consent read, or consent revoke relationship. Request access from an administrator if needed.",
       );
     } else if (resourceToken === "audit") {
       explanation = t(
         "msg.dev.forbidden.user.audit",
-        "해당 앱(RP)에 대한 감사 로그 조회는 'RP 관리자', '감사 조회' 관계가 부여된 경우에만 사용할 수 있습니다. 권한이 필요하면 관리자에게 요청하세요.",
+        "Viewing audit logs for this application requires an RP administrator or audit read relationship. Request access from an administrator if needed.",
       );
     } else {
       explanation = t(
         "msg.dev.forbidden.user.clients",
-        "일반 사용자 계정은 담당 RP(앱)에 대한 운영 또는 관리 관계가 부여된 경우에만 해당 기능을 사용할 수 있습니다. 권한이 필요하면 관리자에게 요청하세요.",
+        "Standard user accounts can use this feature only when an operational or administrative relationship is granted for the target RP. Request access from an administrator if needed.",
       );
     }
   }
@@ -51,9 +51,9 @@ export function ForbiddenMessage({ resourceToken }: Props) {
       ? t("ui.dev.audit.title", "Audit Logs")
       : resourceToken === "consents"
         ? t("ui.dev.clients.consents.title", "User Consent Grants")
-        : t("ui.dev.clients.registry.subtitle", "연동 앱");
+        : t("ui.dev.clients.registry.subtitle", "Connected Applications");
 
-  const title = t("msg.dev.forbidden.title", "{{resource}} 접근 권한 없음", {
+  const title = t("msg.dev.forbidden.title", "Access denied: {{resource}}", {
     resource: resourceLabel,
   });
 
diff --git a/devfront/src/components/layout/AppLayout.tsx b/devfront/src/components/layout/AppLayout.tsx
index be1da833..0f5e1c71 100644
--- a/devfront/src/components/layout/AppLayout.tsx
+++ b/devfront/src/components/layout/AppLayout.tsx
@@ -32,7 +32,7 @@ const navItems = [
   },
   {
     labelKey: "ui.dev.nav.developer_request",
-    labelFallback: "개발자 권한 신청",
+    labelFallback: "Developer Access Request",
     to: "/developer-requests",
     icon: ClipboardCheck,
   },
@@ -71,7 +71,11 @@ function AppLayout() {
   });
 
   const handleLogout = () => {
-    if (window.confirm(t("msg.dev.logout_confirm", "로그아웃 하시겠습니까?"))) {
+    if (
+      window.confirm(
+        t("msg.dev.logout_confirm", "Are you sure you want to log out?"),
+      )
+    ) {
       auth.removeUser();
       navigate("/login");
     }
@@ -136,7 +140,7 @@ function AppLayout() {
       try {
         await auth.signinSilent();
       } catch (error) {
-        console.error("세션 자동 연장에 실패했습니다.", error);
+        console.error("Silent session renewal failed.", error);
       } finally {
         isRenewInFlightRef.current = false;
       }
@@ -184,7 +188,7 @@ function AppLayout() {
       try {
         await auth.signinSilent();
       } catch (error) {
-        console.error("세션 무제한 유지 갱신에 실패했습니다.", error);
+        console.error("Unlimited session keepalive renewal failed.", error);
       } finally {
         isRenewInFlightRef.current = false;
       }
@@ -241,7 +245,7 @@ function AppLayout() {
     void auth
       .signinSilent()
       .catch((error) => {
-        console.error("세션 자동 연장에 실패했습니다.", error);
+        console.error("Silent session renewal failed.", error);
       })
       .finally(() => {
         isRenewInFlightRef.current = false;
@@ -289,15 +293,15 @@ function AppLayout() {
 
   let sessionToneClass =
     "border-emerald-500/30 bg-emerald-500/10 text-emerald-700 dark:text-emerald-300";
-  let sessionText = t("ui.dev.session.active", "세션 활성");
+  let sessionText = t("ui.dev.session.active", "Session active");
 
   if (remainingMs === null) {
     sessionToneClass = "border-border bg-card text-muted-foreground";
-    sessionText = t("ui.dev.session.unknown", "알 수 없음");
+    sessionText = t("ui.dev.session.unknown", "Unknown");
   } else if (remainingMs <= 0) {
     sessionToneClass =
       "border-rose-500/30 bg-rose-500/10 text-rose-700 dark:text-rose-300";
-    sessionText = t("ui.dev.session.expired", "세션 만료");
+    sessionText = t("ui.dev.session.expired", "Session expired");
   } else if (
     remainingMinutes !== null &&
     remainingSeconds !== null &&
@@ -307,7 +311,7 @@ function AppLayout() {
       "border-amber-500/30 bg-amber-500/10 text-amber-700 dark:text-amber-300";
     sessionText = t(
       "ui.dev.session.expiring",
-      "만료 임박: {{minutes}}분 {{seconds}}초 남음",
+      "Expiring soon: {{minutes}}m {{seconds}}s left",
       {
         minutes: remainingMinutes,
         seconds: remainingSeconds,
@@ -316,7 +320,7 @@ function AppLayout() {
   } else {
     sessionText = t(
       "ui.dev.session.remaining",
-      "만료 예정: {{minutes}}분 {{seconds}}초 남음",
+      "Expires in {{minutes}}m {{seconds}}s",
       {
         minutes: remainingMinutes ?? 0,
         seconds: remainingSeconds ?? 0,
@@ -343,7 +347,7 @@ function AppLayout() {
               </div>
               <div>
                 <p className="text-xs uppercase tracking-[0.18em] text-muted-foreground">
-                  {t("ui.dev.brand", "Baron 로그인")}
+                  {t("ui.dev.brand", "Baron Sign In")}
                 </p>
                 <h1 className="text-lg font-semibold">
                   {t("ui.dev.console_title", "Developer Console")}
@@ -423,7 +427,7 @@ function AppLayout() {
                 type="button"
                 onClick={toggleTheme}
                 className="inline-flex items-center gap-2 rounded-full border border-border px-3 py-2 text-muted-foreground transition hover:bg-muted/20"
-                aria-label={t("ui.common.theme_toggle", "테마 전환")}
+                aria-label={t("ui.common.theme_toggle", "Toggle theme")}
               >
                 {theme === "light" ? <Sun size={16} /> : <Moon size={16} />}
                 {theme === "light"
@@ -447,7 +451,7 @@ function AppLayout() {
                   className="inline-flex items-center gap-3 rounded-full border border-border bg-card px-3 py-2 transition hover:bg-muted/20"
                   aria-haspopup="menu"
                   aria-expanded={isProfileMenuOpen}
-                  aria-label={t("ui.dev.profile.menu_aria", "계정 메뉴 열기")}
+                  aria-label={t("ui.dev.profile.menu_aria", "Open account menu")}
                 >
                   <div className="grid h-8 w-8 place-items-center rounded-full bg-primary/15 text-xs font-semibold text-primary">
                     {profileInitial}
@@ -496,14 +500,14 @@ function AppLayout() {
                       <div className="flex items-center justify-between gap-3">
                         <div>
                           <p className="text-sm font-medium text-foreground">
-                            {t("ui.dev.session.auto_extend", "세션 만료 관리")}
+                            {t("ui.dev.session.auto_extend", "Session expiry")}
                           </p>
                           <p className="text-xs text-muted-foreground">
                             {isSessionExpiryEnabled
                               ? sessionText
                               : t(
                                   "ui.dev.session.disabled",
-                                  "세션 만료 비활성화",
+                                  "Session expiry disabled",
                                 )}
                           </p>
                         </div>
@@ -539,7 +543,7 @@ function AppLayout() {
                       }}
                     >
                       <UserIcon size={16} className="text-muted-foreground" />
-                      <span>{t("ui.dev.profile.title", "내 정보")}</span>
+                      <span>{t("ui.dev.profile.title", "My Profile")}</span>
                     </button>
                     <button
                       type="button"
diff --git a/userfront/lib/core/constants/error_whitelist.dart b/userfront/lib/core/constants/error_whitelist.dart
index af4e8558..d0570f6a 100644
--- a/userfront/lib/core/constants/error_whitelist.dart
+++ b/userfront/lib/core/constants/error_whitelist.dart
@@ -1,14 +1,15 @@
-const Map<String, String> internalErrorWhitelistMessages = {
-  'settings_disabled': '현재 계정 설정 화면은 준비 중입니다.',
-  'invalid_session': '세션이 만료되었습니다. 다시 로그인해 주세요.',
-  'verification_required': '추가 인증이 필요합니다. 안내에 따라 진행해 주세요.',
-  'recovery_expired': '재설정 링크가 만료되었습니다. 다시 요청해 주세요.',
-  'recovery_invalid': '재설정 링크가 유효하지 않습니다.',
-  'rate_limited': '요청이 많습니다. 잠시 후 다시 시도해 주세요.',
-  'not_found': '요청한 페이지를 찾을 수 없습니다.',
-  'bad_request': '입력값을 확인해 주세요.',
-  'password_or_email_mismatch': '이메일 혹은 비밀번호가 일치하지 않습니다.',
-  'tenant_not_allowed': '허용되지 않은 테넌트입니다.',
+const Map<String, String> internalErrorWhitelistMessageKeys = {
+  'settings_disabled': 'msg.userfront.error.whitelist.settings_disabled',
+  'invalid_session': 'msg.userfront.error.whitelist.invalid_session',
+  'verification_required': 'msg.userfront.error.whitelist.verification_required',
+  'recovery_expired': 'msg.userfront.error.whitelist.recovery_expired',
+  'recovery_invalid': 'msg.userfront.error.whitelist.recovery_invalid',
+  'rate_limited': 'msg.userfront.error.whitelist.rate_limited',
+  'not_found': 'msg.userfront.error.whitelist.not_found',
+  'bad_request': 'msg.userfront.error.whitelist.bad_request',
+  'password_or_email_mismatch':
+      'msg.userfront.error.whitelist.password_or_email_mismatch',
+  'tenant_not_allowed': 'msg.userfront.error.whitelist.tenant_not_allowed',
 };
 
 const Set<String> oryBypassErrorCodes = {
diff --git a/userfront/lib/core/services/auth_proxy_service.dart b/userfront/lib/core/services/auth_proxy_service.dart
index 651ddd23..8d455e11 100644
--- a/userfront/lib/core/services/auth_proxy_service.dart
+++ b/userfront/lib/core/services/auth_proxy_service.dart
@@ -65,7 +65,7 @@ class AuthProxyService {
     } else {
       throw _error(
         'err.userfront.auth_proxy.password_policy_fetch',
-        '비밀번호 정책을 불러오지 못했습니다.',
+        'Failed to load the password policy.',
       );
     }
   }
@@ -84,7 +84,7 @@ class AuthProxyService {
       }
       throw _error(
         'err.userfront.auth_proxy.profile_load',
-        '프로필을 불러오지 못했습니다: {{error}}',
+        'Failed to load the profile: {{error}}',
         detail: response.body,
       );
     } finally {
@@ -110,7 +110,7 @@ class AuthProxyService {
       }
       throw _error(
         'err.userfront.auth_proxy.profile_load',
-        '프로필을 불러오지 못했습니다: {{error}}',
+        'Failed to load the profile: {{error}}',
         detail: response.body,
       );
     } finally {
@@ -144,7 +144,7 @@ class AuthProxyService {
     } else {
       throw _error(
         'err.userfront.auth_proxy.tenant_info_fetch',
-        '테넌트 정보를 불러오지 못했습니다.',
+        'Failed to load tenant information.',
       );
     }
   }
@@ -180,7 +180,7 @@ class AuthProxyService {
     } else {
       throw _error(
         'err.userfront.auth_proxy.login_init',
-        '로그인 초기화에 실패했습니다: {{error}}',
+        'Failed to initialize login: {{error}}',
         detail: response.body,
       );
     }
@@ -205,7 +205,7 @@ class AuthProxyService {
     }
     throw _error(
       'err.userfront.auth_proxy.login_poll',
-      '로그인 상태 확인에 실패했습니다: {{error}}',
+      'Failed to check login status: {{error}}',
       detail: response.body,
     );
   }
@@ -227,7 +227,7 @@ class AuthProxyService {
     } else {
       throw _error(
         'err.userfront.auth_proxy.verify_failed',
-        '검증에 실패했습니다: {{error}}',
+        'Verification failed: {{error}}',
         detail: response.body,
       );
     }
@@ -261,7 +261,7 @@ class AuthProxyService {
     } else {
       throw _error(
         'err.userfront.auth_proxy.verify_failed',
-        '검증에 실패했습니다: {{error}}',
+        'Verification failed: {{error}}',
         detail: response.body,
       );
     }
@@ -281,7 +281,7 @@ class AuthProxyService {
       if (response.statusCode != 200) {
         throw _error(
           'err.userfront.dashboard.sessions.revoke',
-          '세션 종료에 실패했습니다: {{error}}',
+          'Failed to revoke the session: {{error}}',
           detail: response.body,
         );
       }
@@ -304,7 +304,7 @@ class AuthProxyService {
       if (response.statusCode != 200) {
         throw _error(
           'err.userfront.dashboard.sessions.load',
-          '활성 세션을 불러오지 못했습니다: {{error}}',
+          'Failed to load the active sessions: {{error}}',
           detail: response.body,
         );
       }
@@ -342,7 +342,7 @@ class AuthProxyService {
     } else {
       throw _error(
         'err.userfront.auth_proxy.verify_failed',
-        '검증에 실패했습니다: {{error}}',
+        'Verification failed: {{error}}',
         detail: response.body,
       );
     }
@@ -568,7 +568,7 @@ class AuthProxyService {
     if (response.statusCode != 200) {
       throw _error(
         'err.userfront.auth_proxy.sms_send',
-        'SMS 전송에 실패했습니다: {{error}}',
+        'Failed to send SMS: {{error}}',
         detail: response.body,
       );
     }
@@ -591,7 +591,7 @@ class AuthProxyService {
     } else {
       throw _error(
         'err.userfront.auth_proxy.code_verify',
-        '인증 코드 확인에 실패했습니다: {{error}}',
+        'Failed to verify the code: {{error}}',
         detail: response.body,
       );
     }
@@ -609,7 +609,7 @@ class AuthProxyService {
     } else {
       throw _error(
         'err.userfront.auth_proxy.qr_init',
-        'QR 로그인을 시작하지 못했습니다: {{error}}',
+        'Failed to start QR login: {{error}}',
         detail: response.body,
       );
     }
@@ -631,7 +631,7 @@ class AuthProxyService {
     }
     throw _error(
       'err.userfront.auth_proxy.qr_poll',
-      'QR 상태 확인에 실패했습니다: {{error}}',
+      'Failed to check QR status: {{error}}',
       detail: response.body,
     );
   }
@@ -669,7 +669,7 @@ class AuthProxyService {
       if (response.statusCode != 200) {
         throw _error(
           'err.userfront.auth_proxy.qr_approve',
-          'QR 승인에 실패했습니다: {{error}}',
+          'Failed to approve QR login: {{error}}',
           detail: response.body,
         );
       }
@@ -720,7 +720,7 @@ class AuthProxyService {
     if (response.statusCode != 200) {
       throw _error(
         'err.userfront.auth_proxy.user_create',
-        '사용자 생성에 실패했습니다: {{error}}',
+        'Failed to create the user: {{error}}',
         detail: response.body,
       );
     }
@@ -749,7 +749,7 @@ class AuthProxyService {
     } else {
       throw _error(
         'err.userfront.auth_proxy.user_list',
-        '사용자 목록 조회에 실패했습니다: {{error}}',
+        'Failed to load the user list: {{error}}',
         detail: response.body,
       );
     }
@@ -770,7 +770,7 @@ class AuthProxyService {
     if (response.statusCode != 200) {
       throw _error(
         'err.userfront.auth_proxy.user_delete',
-        '사용자 삭제에 실패했습니다: {{error}}',
+        'Failed to delete the user: {{error}}',
         detail: response.body,
       );
     }
@@ -796,7 +796,7 @@ class AuthProxyService {
     if (response.statusCode != 200) {
       throw _error(
         'err.userfront.auth_proxy.user_status_update',
-        '상태 업데이트에 실패했습니다: {{error}}',
+        'Failed to update the user status: {{error}}',
         detail: response.body,
       );
     }
@@ -829,7 +829,7 @@ class AuthProxyService {
     if (response.statusCode != 200) {
       throw _error(
         'err.userfront.auth_proxy.user_update',
-        '사용자 수정에 실패했습니다: {{error}}',
+        'Failed to update the user: {{error}}',
         detail: response.body,
       );
     }
@@ -855,7 +855,7 @@ class AuthProxyService {
       } else {
         throw _error(
           'err.userfront.auth_proxy.linked_apps_load',
-          '연동된 앱 목록을 불러오지 못했습니다.',
+          'Failed to load linked applications.',
         );
       }
     } finally {
@@ -1043,7 +1043,7 @@ class AuthProxyService {
     if (response.statusCode != 200) {
       throw _error(
         'err.userfront.auth_proxy.phone_code_send',
-        '인증 코드 전송에 실패했습니다: {{error}}',
+        'Failed to send the verification code: {{error}}',
         detail: response.body,
       );
     }
diff --git a/userfront/lib/features/auth/presentation/error_screen.dart b/userfront/lib/features/auth/presentation/error_screen.dart
index 016d3fe4..ec89fdf7 100644
--- a/userfront/lib/features/auth/presentation/error_screen.dart
+++ b/userfront/lib/features/auth/presentation/error_screen.dart
@@ -282,9 +282,9 @@ class _ErrorScreenState extends State<ErrorScreen> {
     final isProd = widget.isProdOverride ?? AuthProxyService.isProdEnv;
     final normalizedCode = (widget.errorCode ?? '').trim();
     final hasCode = normalizedCode.isNotEmpty;
-    final internalWhitelistFallback =
-        internalErrorWhitelistMessages[normalizedCode];
-    final isInternalWhitelisted = internalWhitelistFallback != null;
+    final internalWhitelistKey =
+        internalErrorWhitelistMessageKeys[normalizedCode];
+    final isInternalWhitelisted = internalWhitelistKey != null;
     final isOryBypass = hasCode && oryBypassErrorCodes.contains(normalizedCode);
     final isKnownProdCode = hasCode && (isInternalWhitelisted || isOryBypass);
     final isTenantAccessBlocked = normalizedCode == 'tenant_not_allowed';
@@ -294,7 +294,7 @@ class _ErrorScreenState extends State<ErrorScreen> {
     final title = isTenantAccessBlocked
         ? tr(
             'msg.userfront.error.tenant.page_title',
-            fallback: '애플리케이션 접근이 제한되었습니다',
+            fallback: 'Application access is restricted',
           )
         : isProd
         ? tr('msg.userfront.error.title')
@@ -335,14 +335,11 @@ class _ErrorScreenState extends State<ErrorScreen> {
     final detail = isTenantAccessBlocked
         ? tr(
             'msg.userfront.error.tenant.detail',
-            fallback: '현재 로그인된 계정은 이 애플리케이션에 접근할 수 없습니다.',
+            fallback: 'The current signed-in account cannot access this application.',
           )
         : isProd
         ? (isInternalWhitelisted
-              ? tr(
-                  'msg.userfront.error.whitelist.$normalizedCode',
-                  fallback: internalWhitelistFallback,
-                )
+              ? tr(internalWhitelistKey!)
               : (isOryBypass
                     ? tr(
                         'msg.userfront.error.ory.$normalizedCode',
@@ -422,7 +419,7 @@ class _ErrorScreenState extends State<ErrorScreen> {
                                   Text(
                                     tr(
                                       'msg.userfront.error.tenant.title',
-                                      fallback: '접근 제한 정보',
+                                      fallback: 'Access restriction details',
                                     ),
                                     style: theme.textTheme.titleSmall?.copyWith(
                                       fontWeight: FontWeight.w700,
@@ -447,7 +444,7 @@ class _ErrorScreenState extends State<ErrorScreen> {
                                           child: Text(
                                             tr(
                                               'msg.userfront.error.tenant.loading',
-                                              fallback: '현재 계정 정보를 불러오는 중입니다.',
+                                              fallback: 'Loading the current account details.',
                                             ),
                                             style: theme.textTheme.bodySmall
                                                 ?.copyWith(
@@ -462,39 +459,39 @@ class _ErrorScreenState extends State<ErrorScreen> {
                                     _InfoRow(
                                       label: tr(
                                         'msg.userfront.error.tenant.account',
-                                        fallback: '계정',
+                                        fallback: 'Account',
                                       ),
                                       value: emailLabel.isNotEmpty
                                           ? emailLabel
                                           : tr(
                                               'msg.userfront.error.tenant.account_unknown',
-                                              fallback: '알 수 없음',
+                                              fallback: 'Unknown',
                                             ),
                                     ),
                                     const SizedBox(height: 8),
                                     _InfoRow(
                                       label: tr(
                                         'msg.userfront.error.tenant.primary_tenant',
-                                        fallback: '대표 소속 테넌트',
+                                        fallback: 'Primary affiliated tenant',
                                       ),
                                       value: tenantLabel.isNotEmpty
                                           ? tenantLabel
                                           : tr(
                                               'msg.userfront.error.tenant.tenant_unknown',
-                                              fallback: '알 수 없음',
+                                              fallback: 'Unknown',
                                             ),
                                     ),
                                     const SizedBox(height: 8),
                                     _InfoRow(
                                       label: tr(
                                         'msg.userfront.error.tenant.affiliated_tenants',
-                                        fallback: '전체 소속 테넌트',
+                                        fallback: 'All affiliated tenants',
                                       ),
                                       value: affiliatedTenantLabels.isNotEmpty
                                           ? affiliatedTenantLabels.join(', ')
                                           : tr(
                                               'msg.userfront.error.tenant.tenant_unknown',
-                                              fallback: '알 수 없음',
+                                              fallback: 'Unknown',
                                             ),
                                     ),
                                     if (showTenantLookupFallback) ...[
@@ -503,7 +500,7 @@ class _ErrorScreenState extends State<ErrorScreen> {
                                         tr(
                                           'msg.userfront.error.tenant.lookup_fallback',
                                           fallback:
-                                              '표시 정보가 충분하지 않아 일부 항목은 확인되지 않을 수 있습니다.',
+                                              'Some fields may be unavailable because there is not enough profile information to display.',
                                         ),
                                         style: theme.textTheme.bodySmall
                                             ?.copyWith(
@@ -518,7 +515,7 @@ class _ErrorScreenState extends State<ErrorScreen> {
                                         tr(
                                           'msg.userfront.error.tenant.load_failed',
                                           fallback:
-                                              '계정 정보를 확인하지 못했습니다. 다시 시도해 주세요.',
+                                              'Failed to load account details. Please try again.',
                                         ),
                                         style: theme.textTheme.bodySmall
                                             ?.copyWith(
@@ -548,7 +545,7 @@ class _ErrorScreenState extends State<ErrorScreen> {
                                   Text(
                                     tr(
                                       'msg.userfront.error.tenant.allowed_box_title',
-                                      fallback: '접속 가능 테넌트',
+                                      fallback: 'Allowed tenants',
                                     ),
                                     style: theme.textTheme.titleSmall?.copyWith(
                                       fontWeight: FontWeight.w700,
@@ -559,7 +556,7 @@ class _ErrorScreenState extends State<ErrorScreen> {
                                     _InfoRow(
                                       label: tr(
                                         'msg.userfront.error.tenant.allowed_tenants',
-                                        fallback: '접속 가능 테넌트',
+                                        fallback: 'Allowed tenants',
                                       ),
                                       value: allowedTenantLabels.join(', '),
                                     ),
@@ -567,11 +564,11 @@ class _ErrorScreenState extends State<ErrorScreen> {
                                     _InfoRow(
                                       label: tr(
                                         'msg.userfront.error.tenant.allowed_tenants',
-                                        fallback: '접속 가능 테넌트',
+                                        fallback: 'Allowed tenants',
                                       ),
                                       value: tr(
                                         'msg.userfront.error.tenant.tenant_unknown',
-                                        fallback: '알 수 없음',
+                                        fallback: 'Unknown',
                                       ),
                                     ),
                                   ],
diff --git a/userfront/lib/i18n_data.dart b/userfront/lib/i18n_data.dart
index 5d1b4358..b22e69c6 100644
--- a/userfront/lib/i18n_data.dart
+++ b/userfront/lib/i18n_data.dart
@@ -34,9 +34,41 @@ const Map<String, String> koStrings = {
   "err.userfront.auth_proxy.consent_reject": "동의 거부에 실패했습니다.",
   "err.userfront.auth_proxy.linked_app_revoke": "연동 해지에 실패했습니다.",
   "err.userfront.auth_proxy.login_failed": "로그인에 실패했습니다.",
+  "err.userfront.auth_proxy.login_init": "로그인 초기화에 실패했습니다: {{error}}",
+  "err.userfront.auth_proxy.login_poll":
+      "로그인 상태 확인에 실패했습니다: {{error}}",
   "err.userfront.auth_proxy.oidc_accept": "OIDC 로그인 승인에 실패했습니다.",
   "err.userfront.auth_proxy.password_reset_complete": "비밀번호 재설정에 실패했습니다.",
+  "err.userfront.auth_proxy.password_policy_fetch":
+      "비밀번호 정책을 불러오지 못했습니다.",
   "err.userfront.auth_proxy.password_reset_init": "비밀번호 재설정을 시작하지 못했습니다.",
+  "err.userfront.auth_proxy.profile_load":
+      "프로필을 불러오지 못했습니다: {{error}}",
+  "err.userfront.auth_proxy.tenant_info_fetch":
+      "테넌트 정보를 불러오지 못했습니다.",
+  "err.userfront.auth_proxy.verify_failed": "검증에 실패했습니다: {{error}}",
+  "err.userfront.auth_proxy.sms_send": "SMS 전송에 실패했습니다: {{error}}",
+  "err.userfront.auth_proxy.code_verify":
+      "인증 코드 확인에 실패했습니다: {{error}}",
+  "err.userfront.auth_proxy.qr_init":
+      "QR 로그인을 시작하지 못했습니다: {{error}}",
+  "err.userfront.auth_proxy.qr_poll":
+      "QR 상태 확인에 실패했습니다: {{error}}",
+  "err.userfront.auth_proxy.qr_approve": "QR 승인에 실패했습니다: {{error}}",
+  "err.userfront.auth_proxy.user_create":
+      "사용자 생성에 실패했습니다: {{error}}",
+  "err.userfront.auth_proxy.user_list":
+      "사용자 목록 조회에 실패했습니다: {{error}}",
+  "err.userfront.auth_proxy.user_delete":
+      "사용자 삭제에 실패했습니다: {{error}}",
+  "err.userfront.auth_proxy.user_status_update":
+      "상태 업데이트에 실패했습니다: {{error}}",
+  "err.userfront.auth_proxy.user_update":
+      "사용자 수정에 실패했습니다: {{error}}",
+  "err.userfront.auth_proxy.linked_apps_load":
+      "연동된 앱 목록을 불러오지 못했습니다.",
+  "err.userfront.auth_proxy.phone_code_send":
+      "인증 코드 전송에 실패했습니다: {{error}}",
   "err.userfront.profile.load_failed": "프로필을 불러오지 못했습니다: {{error}}",
   "err.userfront.profile.password_change_failed": "비밀번호 변경에 실패했습니다: {{error}}",
   "err.userfront.profile.send_code_failed": "인증번호 전송 실패: {{error}}",
@@ -589,6 +621,8 @@ const Map<String, String> koStrings = {
       "재설정 링크가 만료되었습니다. 다시 요청해 주세요.",
   "msg.userfront.error.whitelist.recovery_invalid": "재설정 링크가 유효하지 않습니다.",
   "msg.userfront.error.whitelist.settings_disabled": "현재 계정 설정 화면은 준비 중입니다.",
+  "msg.userfront.error.whitelist.tenant_not_allowed":
+      "허용되지 않은 테넌트입니다.",
   "msg.userfront.error.whitelist.verification_required":
       "추가 인증이 필요합니다. 안내에 따라 진행해 주세요.",
   "msg.userfront.forgot.description":
@@ -2010,11 +2044,46 @@ const Map<String, String> enStrings = {
   "err.userfront.auth_proxy.linked_app_revoke":
       "Failed to revoke the linked application.",
   "err.userfront.auth_proxy.login_failed": "Login failed.",
+  "err.userfront.auth_proxy.login_init":
+      "Failed to initialize login: {{error}}",
+  "err.userfront.auth_proxy.login_poll":
+      "Failed to check login status: {{error}}",
   "err.userfront.auth_proxy.oidc_accept": "OIDC Accept",
   "err.userfront.auth_proxy.password_reset_complete":
       "Failed to complete the password reset.",
+  "err.userfront.auth_proxy.password_policy_fetch":
+      "Failed to load the password policy.",
   "err.userfront.auth_proxy.password_reset_init":
       "Failed to start the password reset.",
+  "err.userfront.auth_proxy.profile_load":
+      "Failed to load the profile: {{error}}",
+  "err.userfront.auth_proxy.tenant_info_fetch":
+      "Failed to load tenant information.",
+  "err.userfront.auth_proxy.verify_failed":
+      "Verification failed: {{error}}",
+  "err.userfront.auth_proxy.sms_send": "Failed to send SMS: {{error}}",
+  "err.userfront.auth_proxy.code_verify":
+      "Failed to verify the code: {{error}}",
+  "err.userfront.auth_proxy.qr_init":
+      "Failed to start QR login: {{error}}",
+  "err.userfront.auth_proxy.qr_poll":
+      "Failed to check QR status: {{error}}",
+  "err.userfront.auth_proxy.qr_approve":
+      "Failed to approve QR login: {{error}}",
+  "err.userfront.auth_proxy.user_create":
+      "Failed to create the user: {{error}}",
+  "err.userfront.auth_proxy.user_list":
+      "Failed to load the user list: {{error}}",
+  "err.userfront.auth_proxy.user_delete":
+      "Failed to delete the user: {{error}}",
+  "err.userfront.auth_proxy.user_status_update":
+      "Failed to update the user status: {{error}}",
+  "err.userfront.auth_proxy.user_update":
+      "Failed to update the user: {{error}}",
+  "err.userfront.auth_proxy.linked_apps_load":
+      "Failed to load linked applications.",
+  "err.userfront.auth_proxy.phone_code_send":
+      "Failed to send the verification code: {{error}}",
   "err.userfront.profile.load_failed": "Failed to load the profile.",
   "err.userfront.profile.password_change_failed": "Password Change Failed",
   "err.userfront.profile.send_code_failed":
@@ -2669,6 +2738,8 @@ const Map<String, String> enStrings = {
       "The recovery link is invalid.",
   "msg.userfront.error.whitelist.settings_disabled":
       "Account settings are currently unavailable.",
+  "msg.userfront.error.whitelist.tenant_not_allowed":
+      "This tenant is not allowed.",
   "msg.userfront.error.whitelist.verification_required":
       "Additional verification is required. Please follow the instructions.",
   "msg.userfront.forgot.description":