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/locales/ceb/personal.json

@@ -2,6 +2,8 @@
   "personal": {
     "calendar": {
       "title": "Kalendaryo",
+      "kicker": "Pagplano",
+      "intro": "Mga appointment, mga adlawng natawhan ug imong kaugalingong mga entry sa usa ka organisado nga tan-aw.",
       "today": "Karon",
       "newEntry": "Bag-ong entry",
       "editEntry": "Usba ang entry",