Add localization support for search and alarm features in multiple languages

- Updated Japanese, Portuguese, Russian, and Chinese localization files with new strings for search and alarm functionalities.
- Enhanced the search screen with localized titles, subtitles, and filter labels.
- Integrated localization into the alarm screen, including actions and messages related to alarm management.
- Refactored country and language lists to use localized keys for better maintainability.
- Improved user experience by providing localized hints and messages throughout the application.

lib/app.dart

@@ -257,7 +257,7 @@ class _PaginaPrincipalState extends State<_PaginaPrincipal> {
       ScaffoldMessenger.of(context).showSnackBar(
         SnackBar(
           content: Text(
-            'Alarma pospuesta para esta ejecución.',
+            AppLocalizations.of(context).alarmPostponedCurrentExecution,
           ),
         ),
       );