MONITORING erp5_web_renderjs_ui: add needed support for latest ERP5 changes

bt5/erp5_web_renderjs_ui/PathTemplateItem/web_page_module/rjs_gadget_erp5_js.js

@@ -480,6 +480,10 @@
     .allowPublicAcquisition('isDesktopMedia', function isDesktopMedia() {
       return window.matchMedia("(min-width: 85em)").matches;
     })
+    .allowPublicAcquisition("getSelectedLanguage",
+                            function getSelectedLanguage() {
+        return route(this, 'translation_gadget', 'getSelectedLanguage');
+      })
     /////////////////////////////////////////////////////////////////
     // declared methods
     /////////////////////////////////////////////////////////////////