change block personcontent to content more consistent with other templates and less need for if-statements

src/Bundle/ChillEventBundle/Resources/views/Admin/layout.html.twig

@@ -25,7 +25,7 @@
 {% endblock %}
 
 {% block layout_wvm_content %}
-    {% block admin_content %}<!-- block personcontent empty -->
+    {% block admin_content %}<!-- block content empty -->
         <h1>{{ 'Events configuration' |trans }}</h1>
     {% endblock %}
 {% endblock  %}

src/Bundle/ChillEventBundle/Resources/views/Event/listByPerson.html.twig

@@ -21,7 +21,7 @@
 
 {% block title %}{{ 'Events participation' |trans }}{% endblock title %}
 
-{% block personcontent %}
+{% block content %}
 <h2>{{ 'Events participation' |trans }}</h2>
 
 <table class="table table-striped table-bordered mt-3 events">