install twig intl-extra, replace localizeddate filter by format_date

Resources/views/Timeline/single_task_transition_task_context.html.twig

@@ -1,6 +1,6 @@
 <div>
     <h3 class="single-line">
-        {{ event.datetime|localizeddate('long', 'short') }}
+        {{ event.datetime|format_date('long', 'short') }}
         <span class="task"> 
         {% if transition is not null %}
             <span class="statement">{{ task_workflow_metadata(event.task, 'transition.sentence', transition)|trans({ '%user%': event.author.username }) }}</span>