Expected language code for Simplified vs Traditional chinese

[bobergj]

Documentation: https://developers.fitanalytics.com/documentation#list-callbacks-parameters says "in the specified 2-letter language (ISO 639-1)".
But there is no standard 2-letter code for simplified and traditional chinese. Only "zh" for the "Chinese language group" which is a mostly useless code.

We have users in Taiwan, Hong Kong, Macao and most of those expect Traditional Chinese script. The rest of our app outside the fit analytics widget is localised accordingly.

Suggestion, support BCP47 identifiers:
"zh-Hant"
"zh-Hans"
or even better also the local regional variants:
"zh-Hant-TW"
"zh-Hant-HK"