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_zh.dart

@@ -1601,10 +1601,10 @@ class AppLocalizationsZh extends AppLocalizations {
   String get repeater_cliSubtitle => '向复用器发送指令';
 
   @override
-  String get repeater_neighbours => '邻居';
+  String get repeater_neighbors => '邻居';
 
   @override
-  String get repeater_neighboursSubtitle => '查看邻居节点（无需中间节点）。';
+  String get repeater_neighborsSubtitle => '查看邻居节点（无需中间节点）。';
 
   @override
   String get repeater_settings => '设置';
@@ -2251,7 +2251,7 @@ class AppLocalizationsZh extends AppLocalizations {
   }
 
   @override
-  String get neighbors_repeatersNeighbours => '重复使用的邻居';
+  String get neighbors_repeatersNeighbors => '重复使用的邻居';
 
   @override
   String get neighbors_noData => '没有可用的邻居信息。';