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_sk.dart

@@ -1624,10 +1624,10 @@ class AppLocalizationsSk extends AppLocalizations {
   String get repeater_cliSubtitle => 'Pošlite príkazy opakovaču';
 
   @override
-  String get repeater_neighbours => 'Neighbors';
+  String get repeater_neighbours => 'Súsezný';
 
   @override
-  String get repeater_neighboursSubtitle => 'View zero hop neighbors.';
+  String get repeater_neighboursSubtitle => 'Zobraziť susedné body bez skokov.';
 
   @override
   String get repeater_settings => 'Nastavenia';
@@ -2307,21 +2307,32 @@ class AppLocalizationsSk extends AppLocalizations {
   }
 
   @override
-  String get neighbors_ReceivedData => 'Received Neighbours Data';
+  String get neighbors_receivedData => 'Obdielo dáta suseda';
 
   @override
-  String get neighbors_RequestTimedOut => 'Neighbours request timed out.';
+  String get neighbors_requestTimedOut => 'Súďia žiadajú o časové ukončenie.';
 
   @override
   String neighbors_errorLoading(String error) {
-    return 'Error loading neighbors: $error';
+    return 'Chyba pri načítaní susedov: $error';
   }
 
   @override
-  String get neighbors_repeatersNeighbours => 'Repeaters Neighbours';
+  String get neighbors_repeatersNeighbours => 'Opakovadlá Súsezná';
 
   @override
-  String get neighbors_noData => 'No neighbours data available.';
+  String get neighbors_noData =>
+      'Nie je dostupná žiadna informácia o susedoch.';
+
+  @override
+  String neighbors_unknownContact(String pubkey) {
+    return 'Neznáma $pubkey';
+  }
+
+  @override
+  String neighbors_heardAgo(String time) {
+    return 'Počuli sme to: $time dozadu';
+  }
 
   @override
   String get channelPath_title => 'Cesta balíka';