Fixed minor typo (#1181)

Changed "Albums to be backup" to "Albums to be backed up"

mobile/assets/i18n/en-US.json

@@ -62,7 +62,7 @@
   "backup_controller_page_status_off": "Automatic foreground backup is off",
   "backup_controller_page_status_on": "Automatic foreground backup is on",
   "backup_controller_page_storage_format": "{} of {} used",
-  "backup_controller_page_to_backup": "Albums to be backup",
+  "backup_controller_page_to_backup": "Albums to be backed up",
   "backup_controller_page_total": "Total",
   "backup_controller_page_total_sub": "All unique photos and videos from selected albums",
   "backup_controller_page_turn_off": "Turn off foreground backup",
@@ -191,4 +191,4 @@
   "version_announcement_overlay_text_2": "please take your time to visit the ",
   "version_announcement_overlay_text_3": " and ensure your docker-compose and .env setup is up-to-date to prevent any misconfigurations, especially if you use WatchTower or any mechanism that handles updating your server application automatically.",
   "version_announcement_overlay_title": "New Server Version Available \uD83C\uDF89"
-}
+}