Enhance promo export functionality with English localization

- Added support for exporting promo activations and all promo codes with captions and CSV headers in English.
- Updated the promo export handlers to ensure consistent English messaging for user notifications and CSV content.
- Introduced new localization entries for English in the locales files to support the changes.

locales/ru.json

@@ -155,6 +155,19 @@
   "admin_promo_not_found": "Промокод не найден.",
   "admin_promo_export_csv_button": "📄 Экспорт в CSV",
   "admin_promo_export_caption": "📄 Активации промокода {code}",
+  "admin_promo_export_all_generating": "📄 Создаю CSV файл...",
+  "admin_promo_export_all_caption": "📄 Экспорт всех промокодов\n📊 Всего: {count} промокодов",
+  "admin_promo_csv_code": "Код",
+  "admin_promo_csv_bonus_days": "Бонусные дни",
+  "admin_promo_csv_max_activations": "Максимальные активации",
+  "admin_promo_csv_current_activations": "Текущие активации",
+  "admin_promo_csv_status": "Статус",
+  "admin_promo_csv_is_active": "Активен",
+  "admin_promo_csv_valid_until": "Действителен до",
+  "admin_promo_csv_created_at": "Создан",
+  "admin_promo_csv_created_by_admin_id": "Создал (Admin ID)",
+  "csv_yes": "Да",
+  "csv_no": "Нет",
   "admin_promo_edit_select_field": "Выберите поле для редактирования:",
   "admin_promo_prompt_bonus_days": "Введите новое количество бонусных дней:",
   "admin_promo_prompt_max_activations": "Введите новое максимальное количество активаций:",