display permission info on folder view page (#4328)

src/pfwbged/folder/templates/folder_view.pt

@@ -18,7 +18,17 @@
     <div style="display: none;">
       <input id="sort_on" value="sortable_title"/>
       <input id="sort_order" type="checkbox"/>
-     </div>
+    </div>
+
+    <div style="margin-top: 2em">
+    <div tal:condition="context/treating_groups">
+      <label>Modifiable par</label> <div tal:content="structure view/w/treating_groups"/>
+    </div>
+
+    <div tal:condition="context/recipient_groups">
+      <label>Lisible par</label> <div tal:content="structure view/w/recipient_groups"/>
+    </div>
+    </div>
 
 
 <script>