[FIX] website: force default lang for edit master option

Since user is redirected automatically in his preferred language, the button edit_master redirect always to
the current lang and so not the master.

addons/website/static/src/js/website.translator.js

@@ -60,6 +60,7 @@
             ev.preventDefault();
             var link = $('.js_language_selector a[data-default-lang]')[0];
             if (link) {
+                link.pathname = $(link).data('lang') + link.pathname
                 link.search += (link.search ? '&' : '?') + 'enable_editor=1';
                 window.location = link.attributes.href.value;
             }