ui: training: fix subtitle

packages/ui-default/templates/training_detail.html

@@ -25,7 +25,7 @@
           <div class="section__header clearfix">
             <div class="float-left">
               <h1 data-heading id="node-{{ node._id }}" class="section__title">{{ _('Section') }} {{ node['_id'] }}. {{ node['title'].split('\n')[0] }}</h1>
-              {% if node['title'].split('\n')[1] %}<h2 class="section__title">{{ node['title'].split('\n')[1] }}</h2>{% endif %}
+              {% if node['title'].split('\n')[1] %}<h4>{{ node['title'].split('\n')[1] }}</h4>{% endif %}
             </div>
             <div class="float-right">
               <h1 class="section__title training-section-status--text {% if nsdict[node['_id']]['isDone'] %}done{% elif nsdict[node['_id']]['isProgress'] %}progress{% elif nsdict[node['_id']]['isOpen'] %}open{% else %}invalid{% endif %}">
@@ -206,4 +206,4 @@
     </div></div>
   </div>
 </div>
-{% endblock %}
+{% endblock %}