Add promo management action to admin panel and remove panel statistics retrieval

- Introduced a new action for managing promo codes within the admin panel, enhancing admin capabilities.
- Removed the panel statistics retrieval code from the statistics handler to streamline functionality and reduce complexity.
- Updated localization files to reflect changes related to promo management.

bot/handlers/admin/common.py

@@ -105,6 +105,10 @@ async def admin_panel_actions_callback_handler(
     elif action == "view_logs_menu":
         await admin_logs_handlers.display_logs_menu(callback, i18n_data,
                                                     settings, session)
+    elif action == "promo_management":
+        from . import promo_codes as admin_promo_handlers
+        await admin_promo_handlers.promo_management_handler(
+            callback, i18n_data, settings, session)
     elif action == "sync_panel":
 
         await admin_sync_handlers.sync_command_handler(