feat(localization): expand language support and enhance UI for user settings

- Added support for additional UI locales including Cebuano and Spanish, improving accessibility for a broader user base.
- Updated language selection components in the AppHeader and SettingsWidget to reflect new language options, enhancing user experience.
- Enhanced localization of various UI elements across components, ensuring consistent language representation and improved user engagement.
- Implemented logic to synchronize user language preferences with backend settings, providing a seamless experience when changing languages.

frontend/src/i18n/index.js

@@ -28,6 +28,7 @@ import cebActivate from './locales/ceb/activate.json';
 import cebError from './locales/ceb/error.json';
 import cebMessage from './locales/ceb/message.json';
 import cebSettings from './locales/ceb/settings.json';
+import cebAdmin from './locales/ceb/admin.json';
 import cebPasswordReset from './locales/ceb/passwordReset.json';
 import cebSocialNetwork from './locales/ceb/socialnetwork.json';
 import cebFriends from './locales/ceb/friends.json';
@@ -124,6 +125,7 @@ const messages = {
     ...cebError,
     ...cebMessage,
     ...cebSettings,
+    ...cebAdmin,
     ...cebPasswordReset,
     ...cebSocialNetwork,
     ...cebFriends,
@@ -178,7 +180,10 @@ const messages = {
 
 const i18n = createI18n({
   locale: store.state.language,
-  fallbackLocale: 'de',
+  fallbackLocale: {
+    ceb: ['en', 'de'],
+    default: ['de']
+  },
   messages
 });