Deleting terms has no effect
While reviewing #5280 I realized that I could not delete a user defined term (other terms should not be deletable by definition).
The term editor did let me delete it. But there was no effect in the database.
When fixing please also check if combo boxes that reference the given vocabulary (and therefore the term) are refreshed correctly or if they still show the term while it does not exist anymore.
We should try to write test to guarantee in future that terms can be deleted.
Maybe related to #5842