[Feature] Changes required for non public tenants (#370)

Co-authored-by: Tim Lorsbach <tim@lorsba.ch>
Reviewed-on: enviPath/enviPy#370

templates/actions/objects/pathway.html

@@ -1,3 +1,5 @@
+{% load envipytags %}
+
 {% if meta.can_edit %}
   <li>
     <a
@@ -15,6 +17,11 @@
       <i class="glyphicon glyphicon-plus"></i> Add Reaction</a
     >
   </li>
+  {% epdb_slot_templates "epdb.actions.objects.pathway.add" as action_button_templates %}
+
+  {% for tpl in action_button_templates %}
+    {% include tpl %}
+  {% endfor %}
   <li role="separator" class="divider"></li>
 {% endif %}
 <li>