apply ckeditor on multiple entities

Apply ckeditor into:

* activity;
* task;
* document;
* accompanying periods

src/Bundle/ChillActivityBundle/Resources/views/Activity/list.html.twig

@@ -46,12 +46,7 @@
                 <td>{{ activity.durationTime|date('H:i') }}</td>
                 <td>
                     {% if activity.comment.comment is not empty %}
-                        <blockquote class="chill-user-quote">
-                            {{ activity.comment.comment|slice(0, 250) }} {#
-                             sf4 check: if 'slice' could replace 'truncate' filter ?
-                             truncate come with twig-extensions, in conflict with twig 3
-                             #}
-                        </blockquote>
+                            {{ activity.comment|chill_entity_render_box( { 'limit_lines': 3, 'metadata': false } ) }}
                     {% endif %}
                     {%- if activity.reasons is empty -%}
                         {{ 'No reason associated'|trans }}