Fix translation in event bundle using new pluralization syntax

src/Bundle/ChillEventBundle/Resources/views/Participation/_ignored_participations.html.twig

@@ -1,7 +1,7 @@
 {% import '@ChillPerson/Person/macro.html.twig' as person_macro %}
 
 {% if ignored_participations|length > 0 %}
-    <p>{% transchoice ignored_participations|length %}The following people have been ignored because they are already participating on the event{% endtranschoice %}&nbsp;:</p>
+    <p>{{ 'ignored_participations'|trans({'count': ignored_participations|length}) }}:</p>
     <ul>
         {% for p in ignored_participations %}
             <li>{{ person_macro.render(p.person) }}</li>