Rename chinese translation file

Do you reckon renaming the 'zh' translation files?

Calling `TwitterCldr.convert_locale('zh-cn')` returns `=> :zh`
and
Calling `TwitterCldr.convert_locale('zh-tw')` returns `=> :"zh-Hant"`

Since based of TwitterCldr::TWITTER_LOCALE_MAP, it is supporting the following locales
`{:msa=>:ms, :"zh-cn"=>:zh, :"zh-tw"=>:"zh-Hant", :no=>:nb}`