Correction boutons alignés

src/agenda_culturel/templates/agenda_culturel/event_confirm_change_status.html

@@ -34,7 +34,7 @@ Mettre l'événement  {{ event.title }} à la corbeille
         {% endif %}
         </p>
     {{ form }}
-    <div class="grid">
+    <div class="grid buttons">
         <a href="{{ cancel_url }}" role="button" class="secondary">Annuler</a>
         <input type="submit" value="Confirmer">
     </div>