v2.4.2

Added

• Clean up on all hosts. The clean-up dialogs for images, volumes and networks offer
  "All hosts" as the first host option (preselected when the page shows all hosts, otherwise
  the current host). The preview lists per host what would be removed (count and approximate
  size, total at the bottom; hosts with nothing to remove and skipped offline or locked hosts
  are shown), the button shows the total, and confirming cleans up all online hosts in parallel
  (at most four at a time). The result is shown per host (removed, freed space, errors); an
  error on one host does not stop the others. Admin only, with an audit entry per host as before.

Fixed

• In-app notifications in each user's language. Notifications were stored with English detail
  text for everyone. They now store a message key with parameters (new nullable columns, schema
  migration 43) and the notification panel shows the detail in the current UI language
  (English, German, Spanish) and follows a language switch. All notification types are covered
  (hosts, containers, performance, disk, updates, vulnerabilities, backups). Notifications created
  before the update keep their stored text; e-mails are unchanged.
• One Escape closes the notifications panel. With the settings gear tooltip open, the first
  Escape only closed the tooltip; now it closes the panel as well.