Add localized search functionality for contacts (#244)

- Introduced new localization keys for searching contacts, users, favorites, repeaters, and room servers in multiple languages.
- Updated localization files for Italian, Bulgarian, German, English, Spanish, French, Dutch, Polish, Portuguese, Russian, Slovak, Slovenian, Swedish, Ukrainian, and Chinese.
- Enhanced the contacts screen to dynamically display search hints based on the selected contact type filter.
- Modified the map screen to utilize the new search functionality for contacts without a number.

lib/screens/map_screen.dart

@@ -1301,7 +1301,8 @@ class _MapScreenState extends State<MapScreen> {
                         padding: const EdgeInsets.fromLTRB(16, 4, 16, 8),
                         child: TextField(
                           decoration: InputDecoration(
-                            hintText: context.l10n.contacts_searchContacts,
+                            hintText:
+                                context.l10n.contacts_searchContactsNoNumber,
                             prefixIcon: const Icon(Icons.search),
                             border: OutlineInputBorder(
                               borderRadius: BorderRadius.circular(12),