Since the course delete and close action are accessible from within the course menu, it occurred multiple times that a course was deleted by mistake. Users used this menu item but actually wanted to delete a course element in the course editor.
In a first attempt the dialog was made more red-ish and we added an additional checkbox, however users still deleted courses by mistake.
The new solution is to move the two actions to a dedicated course life-cycle page. In later releases this page will also be used to manage other states of the course life cycle.