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_ru.arb

@@ -472,8 +472,8 @@
   "repeater_telemetrySubtitle": "Просмотр телеметрии датчиков и системной статистики",
   "repeater_cli": "CLI",
   "repeater_cliSubtitle": "Отправка команд репитеру",
-  "repeater_neighbours": "Соседи",
-  "repeater_neighboursSubtitle": "Просмотр соседей на нулевом хопе.",
+  "repeater_neighbors": "Соседи",
+  "repeater_neighborsSubtitle": "Просмотр соседей на нулевом хопе.",
   "repeater_settings": "Настройки",
   "repeater_settingsSubtitle": "Настройка параметров репитера",
   "repeater_statusTitle": "Статус репитера",
@@ -666,7 +666,7 @@
   "neighbors_receivedData": "Полученные данные о соседях",
   "neighbors_requestTimedOut": "Время ожидания данных о соседях истекло.",
   "neighbors_errorLoading": "Ошибка загрузки соседей: {error}",
-  "neighbors_repeatersNeighbours": "Соседи репитеров",
+  "neighbors_repeatersNeighbors": "Соседи репитеров",
   "neighbors_noData": "Данные о соседях недоступны.",
   "neighbors_unknownContact": "Неизвестный {pubkey}",
   "neighbors_heardA ago": "Слышали: {time} назад",