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_es.arb

@@ -1356,12 +1356,12 @@
       }
     }
   },
-  "repeater_neighbours": "Vecinos",
-  "repeater_neighboursSubtitle": "Ver vecinos de salto cero.",
+  "repeater_neighbors": "Vecinos",
+  "repeater_neighborsSubtitle": "Ver vecinos de salto cero.",
   "neighbors_receivedData": "Recibidas Datos de Vecinos",
   "neighbors_requestTimedOut": "Los vecinos solicitan que se desconecte.",
   "neighbors_errorLoading": "Error al cargar vecinos: {error}",
-  "neighbors_repeatersNeighbours": "Repetidores Vecinos",
+  "neighbors_repeatersNeighbors": "Repetidores Vecinos",
   "neighbors_noData": "No hay datos de vecinos disponibles.",
   "channels_joinPrivateChannel": "Únete a un Canal Privado",
   "channels_createPrivateChannel": "Crear un Canal Privado",