Merge branch 'hotfix/fix_admin_event_view' into develop

* hotfix/fix_admin_event_view:
  edit urls
  add test to admin events controller
edit make up for admin/event
edit make up for participant event show
Merge branch 'release/1.8.4'

* release/1.8.4:
  edit make up for participant event show
  edit make up for admin/event