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/register.json

@@ -2,7 +2,7 @@
   "register": {
     "title": "Pagrehistro sa yourPart",
     "email": "E-mail address",
-    "username": "Username",
+    "username": "Ngalan sa user",
     "password": "Password",
     "repeatPassword": "Usba ang password",
     "language": "Pinulongan",
@@ -20,7 +20,7 @@
     "usernameinuse": "Dili magamit ang username.",
     "validation": {
       "invalidEmail": "Palihog isulod ang sakto nga email address.",
-      "usernameTooShort": "Ang username kinahanglan adunay labing menos 3 ka karakter.",
+      "usernameTooShort": "Ang ngalan sa user kinahanglan adunay labing menos 3 ka karakter.",
       "passwordHint": "Kinahanglan labing menos 8 ka karakter.",
       "passwordTooShort": "Mubo ra ang password."
     }