I18n in Cocos Creator

I installed i18n by Cocos Extension Store. It seems identical with thing by link
It works only when I open i18n language menu in Editor (Extension -> i18n). This action forces values recalculating and all strings on an Editor screen seems normal.
No result in simulator or browser. In my script I have

const i18n = require('LanguageData');

in top of file, and

i18n.init('en')

en.js exists.

What’s may be wrong?