Delete mount actions
Goal of this MR:
- allow deletion of mount actions
- use the same delete dialog component in the whole project
Note: Currently, the deletion is only possible with the following preconditions:
- the mounted entity has no children mounted on it
- the mounted entity is not used in a dynamic location action
- the begin date and the end date of the mount action have to be equal
Closes #362 (closed)
Requires backend!421 (merged)
Edited by Marc Hanisch