Add untranslated messages file and update localization keys

- Added `untranslated.json` to track untranslated messages.
- Updated localization keys in various language files to use camelCase format for consistency.
- Modified `neighbours_screen.dart` to reference updated localization keys.

lib/l10n/app_localizations_sl.dart

@@ -1625,10 +1625,10 @@ class AppLocalizationsSl extends AppLocalizations {
       'Pošlji ukazne povelje na ponovitveno enoto.';
 
   @override
-  String get repeater_neighbours => 'Neighbors';
+  String get repeater_neighbours => 'Sosedi';
 
   @override
-  String get repeater_neighboursSubtitle => 'View zero hop neighbors.';
+  String get repeater_neighboursSubtitle => 'Pogledati nič sosednjih hopjev.';
 
   @override
   String get repeater_settings => 'Nastavitve';
@@ -2312,21 +2312,32 @@ class AppLocalizationsSl extends AppLocalizations {
   }
 
   @override
-  String get neighbors_ReceivedData => 'Received Neighbours Data';
+  String get neighbors_receivedData => 'Prejeto podatke o sosedih';
 
   @override
-  String get neighbors_RequestTimedOut => 'Neighbours request timed out.';
+  String get neighbors_requestTimedOut =>
+      'Sosedi zahtevajo izklop po dogovoru.';
 
   @override
   String neighbors_errorLoading(String error) {
-    return 'Error loading neighbors: $error';
+    return 'Napaka pri obnašanju sosedov: $error';
   }
 
   @override
-  String get neighbors_repeatersNeighbours => 'Repeaters Neighbours';
+  String get neighbors_repeatersNeighbours => 'Ponovitve Sosedi';
 
   @override
-  String get neighbors_noData => 'No neighbours data available.';
+  String get neighbors_noData => 'Niso na voljo podatki o sosedih.';
+
+  @override
+  String neighbors_unknownContact(String pubkey) {
+    return 'Nepoznano $pubkey';
+  }
+
+  @override
+  String neighbors_heardAgo(String time) {
+    return 'Udeleženec je prejel sporočilo $time nazaj.';
+  }
 
   @override
   String get channelPath_title => 'Pot do paketa';