Task: Archive tool doesn't list the single tasks, only group tasks

The archive tool in the course does not list the single tasks, even though it lists all group tasks. The entry from the old course element is still shown, but is not connected to the new task element.

Should be renamed to DE: Aufgaben EN: Tasks, and a click should open the list of available task course elements.

course from the screens: https://testing.frentix.com/test8/url/RepositoryEntry/243957761