Refactor localization keys for "neighbors" terminology across multiple languages

- Updated localization keys from "neighbours" to "neighbors" in the following files:
  - app_localizations_bg.dart
  - app_localizations_de.dart
  - app_localizations_en.dart
  - app_localizations_es.dart
  - app_localizations_fr.dart
  - app_localizations_it.dart
  - app_localizations_nl.dart
  - app_localizations_pl.dart
  - app_localizations_pt.dart
  - app_localizations_ru.dart
  - app_localizations_sk.dart
  - app_localizations_sl.dart
  - app_localizations_sv.dart
  - app_localizations_uk.dart
  - app_localizations_zh.dart
- Updated corresponding ARB files to reflect the changes in keys.
- Renamed the NeighboursScreen to NeighborsScreen in the chat and repeater hub screens for consistency.

lib/l10n/app_localizations_sv.dart

@@ -1662,10 +1662,10 @@ class AppLocalizationsSv extends AppLocalizations {
   String get repeater_cliSubtitle => 'Skicka kommandon till repetitorn';
 
   @override
-  String get repeater_neighbours => 'Grannar';
+  String get repeater_neighbors => 'Grannar';
 
   @override
-  String get repeater_neighboursSubtitle => 'Visa noll hoppgrannar.';
+  String get repeater_neighborsSubtitle => 'Visa noll hoppgrannar.';
 
   @override
   String get repeater_settings => 'Inställningar';
@@ -2356,7 +2356,7 @@ class AppLocalizationsSv extends AppLocalizations {
   }
 
   @override
-  String get neighbors_repeatersNeighbours => 'Upprepar grannar';
+  String get neighbors_repeatersNeighbors => 'Upprepar grannar';
 
   @override
   String get neighbors_noData => 'Inga grannuppgifter finns tillgängliga.';