add a title on page "list activities" and statement if empty

fix #16

Resources/translations/messages.fr.yml

@@ -17,6 +17,7 @@ Update activity: Édition de l'activité
 Scope: Cercle
 Activity data: Données de l'activité
 No reason associated: Aucun sujet
+There isn't any activities.: Aucune activité enregistrée.
 
 #forms
 Activity creation: Nouvelle activité

Resources/views/Activity/list.html.twig

@@ -23,6 +23,11 @@
 {% block title %}{{ 'Activity list' |trans }}{% endblock title %}
 
 {% block personcontent %}
+    <h2>{{ 'Activity list' |trans }}</h2>
+    
+    {% if activities|length == 0 %}
+        <p class="chill-no-data-statement">{{ "There isn't any activities."|trans }}</p>
+    {% else %}
     <table class="records_list">
         <thead>
             <tr>
@@ -68,6 +73,7 @@
         {% endfor %}
         </tbody>
     </table>
+    {% endif %}
     
     <p>
         <a href="{{ path('chill_activity_activity_new', {'person_id': person.id}) }}" class="sc-button bt-create">