add collapse partial for volunteers events

app/views/events/_volunteer_events.html.slim

+button.btn.btn-default(data-toggle='collapse' data-target='#events' type='button'  aria-expanded='false' aria-controls='events')
+      = 'Veranstaltungen'
+hr
+#events.collapse
+  .table-responsive
+    table.table
+      thead
+        th Art
+        th Datum
+        th Zeit
+        th Titel
+        th Departement
+        th
+      tbody
+        - events.each do |event|
+          tr
+            td= t(".#{event.kind}") if event.kind
+            td= l(event.date.to_date) if event.date
+            td
+              = "#{(event.start_time.strftime('%H:%M'))} - " if event.start_time
+              = "#{(event.end_time.strftime('%H:%M'))}" if event.end_time
+            td= event.title if event.title
+            td= event.department.contact.last_name if event.department
+            td.index-action-cell.hidden-print
+              span= link_to t_action(:show), event_path(event)

app/views/volunteers/show.html.slim

@@ -192,6 +192,10 @@ h2.small= t('.availability')
   h2.small= t('.old_group_assignments')
   = render 'group_assignments/volunteer_group_assignments_logs', group_assignment_logs: @volunteer.group_assignment_logs
 
+- if @volunteer.events.any?
+  h3#events Veranstaltungen
+  = render 'events/volunteer_events', events: @volunteer.events
+
 nav.navbar.section-navigation
   ul.list-inline
     li= button_link current_user.volunteer? ? t('edit_profile') : t_title(:edit), edit_volunteer_path(@volunteer)