**As** a user of meeting series
**I want to** have a separate action to end the meeting series
**so that** I can cancel / end meeting series early without fiddling with the form

**Acceptance criteria**

* Action menu entry in the meeting series  "End meeting series"

* If start\_date Begin of the insertion>End of the insertion Begin of the deletion <End of the deletion today, this action will not be shown

* Danger confirmation dialog: "Ending the series will delete any future open or scheduled meeting occurrences."

* On confirmation

* Sets "end\_date" to today

* Removes any future scheduled meetings

* Removes any future instantiated meetings