erp5_web_renderjs_ui: fix beforeunload event incompatibility in firefox

bt5/erp5_web_renderjs_ui/PathTemplateItem/web_page_module/rjs_gadget_erp5_router_js.js

@@ -1069,9 +1069,10 @@
         function (event) {
           if (gadget.props.modified) {
             event.returnValue = 'fake';
+            return 'fake';
           }
-          return 'fake';
-        }
+        },
+        false
       );
     });
 }(window, rJS, RSVP, loopEventListener, document, jIO, URI, URL, Blob));
\ No newline at end of file

bt5/erp5_web_renderjs_ui/PathTemplateItem/web_page_module/rjs_gadget_erp5_router_js.xml

@@ -232,7 +232,7 @@
             </item>
             <item>
                 <key> <string>serial</string> </key>
-                <value> <string>965.39308.13571.6894</string> </value>
+                <value> <string>966.2649.17362.11178</string> </value>
             </item>
             <item>
                 <key> <string>state</string> </key>
@@ -250,8 +250,8 @@
                     </tuple>
                     <state>
                       <tuple>
-                        <float>1519043897.55</float>
-                        <string>UTC</string>
+                        <float>1520516819.75</float>
+                        <string>GMT+1</string>
                       </tuple>
                     </state>
                   </object>