Language codes are a combination of the ISO 639-1 language codes and the ISO 3166-1 country codes.
Note: While we normally follow the above standard we have one known instance where we send "zh_Hant_HK" as a language. This should be interpreted as Traditional Chinese, Hong Kong.
The format is this. lc[_cc[_desc]]. The parts in brackets are optional. lc is the 2 character language code. cc is the two character country code. desc is a further qualifier.
Here is the full list of supported country codes as of the time this was written.
|en_GB||English (Great Britain)|
|en_HK||English (Hong Kong)|
|en_NZ||English (New Zealand)|
|en_US||English (United States)|
|en_ZA||English (South Africa)|
|zh_Hant_HK||Traditional Chinese (Hong Kong)|