erp5_officejs_support_request_ui: notify on post comment success

bt5/erp5_officejs_support_request_ui/PathTemplateItem/web_page_module/gadget_supportrequest_pt_form_view_discussable_js.js

@@ -222,6 +222,9 @@
             }
           });
         })
+        .push(function () {
+          return gadget.notifySubmitted({message: "Comment added", status: "success"});
+        })
         .push(function () {
           editor.value = '';
           return gadget.redirect({command: 'reload'});