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/components/MessageboxWidget.vue

@@ -9,7 +9,7 @@
                 {{ message }}
             </div>
             <div class="dialog-footer">
-                <button @click="close()" class="dialog-button">Ok</button>
+                <button @click="close()" class="dialog-button">{{ $t('general.ok') }}</button>
             </div>
         </div>
     </div>