Client: i18n (#8972)

* wip: client: i18n

* remove maxAge from cookies to get same expiration ad localStorage

* set cookies expiration to 10 years

* moment: load translations in browser, moment: only load necessary data, remove jquery, remove bluebird

* ability to change language

* fix logout

* add some requiresLogin: false to static pages

* fix tests

website/server/controllers/api-v3/content.js

@@ -101,6 +101,7 @@ async function saveContentToDisk (language, content) {
 api.getContent = {
   method: 'GET',
   url: '/content',
+  noLanguage: true,
   async handler (req, res) {
     let language = 'en';
     let proposedLang = req.query.language && req.query.language.toString();