Update batch_confirmation.html.twig

1. Replace input type submit to button type submit
2. Add trash icon to the back to list link

Resources/views/CRUD/batch_confirmation.html.twig

@@ -40,12 +40,14 @@ file that was distributed with this source code.
                     {{ form_rest(form) }}
                 </div>
 
-                <input type="submit" class="btn btn-danger" value="{{ 'btn_execute_batch_action'|trans({}, 'SonataAdminBundle') }}" />
+                <button type="submit" class="btn btn-danger"><i class="icon-trash icon-white"></i> {{ 'btn_execute_batch_action'|trans({}, 'SonataAdminBundle') }}</button>
 
                 {% if admin.hasRoute('list') and admin.isGranted('LIST') %}
                     {{ 'delete_or'|trans({}, 'SonataAdminBundle') }}
 
-                    <a class="btn btn-success" href="{{ admin.generateUrl('list') }}">{{ 'link_action_list'|trans({}, 'SonataAdminBundle') }}</a>
+                    <a class="btn btn-success" href="{{ admin.generateUrl('list') }}">
+                        <i class="icon-th-list icon-white"></i> {{ 'link_action_list'|trans({}, 'SonataAdminBundle') }}
+                    </a>
                 {% endif %}
             </form>
         </div>