add translation in update form

Resources/views/Activity/edit.html.twig

@@ -21,6 +21,8 @@
 {% block title %}{{ 'Activity edit' |trans }}{% endblock title %}
 
 {% block personcontent %}
+    <h1>{{ "Update activity"|trans }}</h1>
+    
     {{ form(edit_form) }}
 
     {# {{ form(delete_form) }} #}