[FIX] website: load momentjs locale in frontend

It is for example useful in the form builder with date-kind form field,
the translation of momentjs is done in french.

opw-707986
opw-749544
closes #17103

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

@@ -7,6 +7,7 @@ odoo.define('website.website', function (require) {
     var Widget = require('web.Widget');
     var session = require('web.session');
     var base = require('web_editor.base');
+    var utils = require('web.utils');
 
     var qweb = core.qweb;
     var _t = core._t;
@@ -238,6 +239,10 @@ odoo.define('website.website', function (require) {
         }
     });
 
+    /* Load localizations */
+    var lang = utils.get_cookie('website_lang') || $('html').attr('lang') || 'en_US';
+    ajax.loadJS('/web/webclient/locale/' + lang.replace('-', '_'));
+
     /**
      * Object who contains all method and bind for the top bar, the template is create server side.
      */