Hi,
The translations for HikaShop and HikaMarket are mostly provided by the community.
We didn't receive any zh-cn translation for HikaMarket for the moment, that's why that language is not available.
If you want to help and become a translator, you can use the "contact us" form, it will be easier for the discussion.
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.