版本：
文件：
- https://cdn.bootcdn.net/ajax/libs/polyglot/2.2/css/polyglot-language-switcher.css
- https://cdn.bootcdn.net/ajax/libs/polyglot/2.2/css/polyglot-language-switcher.min.css
- https://cdn.bootcdn.net/ajax/libs/polyglot/2.2/js/jquery.polyglot.language.switcher.js
- https://cdn.bootcdn.net/ajax/libs/polyglot/2.2/js/jquery.polyglot.language.switcher.min.js