By Errong Leng — Jan 24, 2018

language code for Chinese should be start with 'zh'

According to RFC4646 (http://www.ietf.org/rfc/rfc4646.txt)
language codes for Traditional Chinese should be zh-Hant

import { getLanguages } from 'react-native-i18n'
getLanguages().then(languages => {
  console.log(languages);
});

Set system language to Chinese

01-24 17:47:47.957 19851 19873 I ReactNativeJS: [ 'zh-Hans-CN', 'en-US' ]

01-24 17:56:30.754 20563 20584 I ReactNativeJS: [ 'en-US', 'zh-Hans-CN' ]