English version on AMap v2.0

[emilianocds]

How it should the config on AMap v2.0? I tested and its not working:

var map = new AMap.Map('container', {
center: [121.498586, 31.239637],
lang: "en"
});
https://lbs.amap.com/demo/javascript-api/example/map/map-english/