404 error handling on admin pages

[Sabr1n4W]

Currently there is no custom 404 error handling for delete actions on admin pages (e.g. delete users, delete servers, ...)
(Exception: room types index page)
Additional to this the reset password action on user pages also does not have a custom 404 error handling

Describe the solution you'd like

• On index pages. reload table data after 404 error
• On view pages. redirect to index page after 404 error