Editor: Question about i18n support

How can I do something about I18n for three.js?
But it not useful,like this.
```js
// ProjectDir\editor\js\Menubar.File.js
var title = new UI.Panel();
title.setClass( 'title' );
// title.setTextContent( 'File' );
title.setTextContent( '文件' );
container.add( title );
```