fix: ensure heading styling

src/fellchensammlung/templates/fellchensammlung/details/detail-rescue-organization.html

@@ -51,7 +51,7 @@
     </div>
 
 
-    <h2>{% translate 'Vermittlungen der Organisation' %}</h2>
+    <h2 class="title is-2">{% translate 'Vermittlungen der Organisation' %}</h2>
     <div class="container-cards">
         {% if org.adoption_notices %}
             {% for adoption_notice in org.adoption_notices %}