Finger weg!

Maintenance runs anytime, not just once/12 hours. (Normal users can start the maintenance if the last run was at least 12 hours ago.)
Lock editing for all pages (only admins and “editors” can edit):
Unlock editing for all pages (everyone can edit):
Edit-ban list (first set your administrator password in Preferences):
Lock a single page (only admins (not even “editors”) can edit that page):
Unlock a single page:
Rename or delete pages: