add assignee in task list + fix some translation

Resources/views/SingleTask/_list.html.twig

@@ -26,6 +26,14 @@
                                 {% for place in workflow_marked_places(task) %}
                                     <span class="">{{ place|trans }}</span>
                                 {% endfor %}
+                                
+                                {% if task.assignee is not null %}
+                                <dl>
+                                    <dt>{{ 'Assignee'|trans }}</dt>
+                                    <dd>{{ task.assignee.username }}</dd>
+                                </dl>
+                                {% endif %}
+                                    
                             </td>
                             <td>
                                 {% if task.startDate is null and task.warningDate is null and task.endDate is null %}