Improve admin templates for event admin entities + activity reason (category) entities and remove delete and show actions for coherence

src/Bundle/ChillEventBundle/Resources/views/Role/show.html.twig

@@ -25,17 +25,12 @@
         </tbody>
     </table>
 
-    <ul class="record_actions">
+    <ul class="record_actions sticky-form-buttons">
         <li class="cancel">
             <a href="{{ path('chill_event_admin_role') }}" class="btn btn-cancel">{{ 'Back to the list'|trans }}</a>
         </li>
         <li>
             <a href="{{ path('chill_event_admin_role_edit', { 'id': entity.id }) }}" class="btn btn-edit">{{ 'Edit'|trans }}</a>
         </li>
-        <li>
-            {{ form_start(delete_form) }}
-            {{ form_row(delete_form.submit, { 'attr': { 'class' : 'btn btn-delete' }}) }}
-            {{ form_end(delete_form) }}
-        </li>
     </ul>
 {% endblock %}