recurring_events-2.0.x-dev/modules/recurring_events_ical/recurring_events_ical.links.action.yml

entity.event_ical_mapping.add_form:
  route_name: 'entity.event_ical_mapping.add_form'
  title: 'Add iCalendar property mapping'
  appears_on:
    - entity.event_ical_mapping.collection