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/l10n/app_en.arb

@@ -268,7 +268,63 @@
   "contacts_title": "Contacts",
   "contacts_noContacts": "No contacts yet",
   "contacts_contactsWillAppear": "Contacts will appear when devices advertise",
-  "contacts_searchContacts": "Search contacts...",
+  "contacts_unread": "Unread",
+  "contacts_searchContactsNoNumber": "Search Contacts...",
+  "contacts_searchContacts": "Search {number}{str} Contacts...",
+  "@contacts_searchContacts": {
+    "placeholders": {
+      "number": {
+        "type": "int"
+      },
+      "str": {
+        "type": "String"
+      }
+    }
+  },
+  "contacts_searchFavorites": "Search {number}{str} Favorites...",
+  "@contacts_searchFavorites": {
+    "placeholders": {
+      "number": {
+        "type": "int"
+      },
+      "str": {
+        "type": "String"
+      }
+    }
+  },
+  "contacts_searchUsers": "Search {number}{str} Users...",
+  "@contacts_searchUsers": {
+    "placeholders": {
+      "number": {
+        "type": "int"
+      },
+      "str": {
+        "type": "String"
+      }
+    }
+  },
+  "contacts_searchRepeaters": "Search {number}{str} Repeaters...",
+  "@contacts_searchRepeaters": {
+    "placeholders": {
+      "number": {
+        "type": "int"
+      },
+      "str": {
+        "type": "String"
+      }
+    }
+  },
+  "contacts_searchRoomServers": "Search {number}{str} Room servers...",
+  "@contacts_searchRoomServers": {
+    "placeholders": {
+      "number": {
+        "type": "int"
+      },
+      "str": {
+        "type": "String"
+      }
+    }
+  },
   "contacts_noUnreadContacts": "No unread contacts",
   "contacts_noContactsFound": "No contacts or groups found",
   "contacts_deleteContact": "Delete Contact",