Add 'after event ends' trigger to workflows (#4882)

* add after event ends workflow trigger to enum

* add after meetings ends trigger

* fix label for time span

* add deleted label for message template

* add lost changes from merge conflict

* set reminder for already existing bookings

* fix label 'How long before event starts/ends'

Co-authored-by: CarinaWolli <wollencarina@gmail.com>

apps/web/public/static/locales/en/common.json

@@ -1295,5 +1295,7 @@
   "update_timezone": "Update timezone",
   "update_timezone_question": "Update Timezone?",
   "update_timezone_description": "It seems like your local timezone has changed to {{formattedCurrentTz}}.  It's very important to have the correct timezone to prevent bookings at undesired times. Do you want to update it?",
-  "dont_update": "Don't update"
+  "dont_update": "Don't update",
+  "after_event_trigger": "after event ends",
+  "how_long_after": "How long after event ends?"
 }