in chinese gambling site is ilegal and not support, so if you find gambling site from china is very dificult
if about languange, in gambling site is support chage to language
if about mahyong in game gambling china i think is all gambling site is not open, because can play only china people, and in china gambling site is can't legal
I dont think he means a poker website from china. He meant Chinese poker which is a game of luck over skill and only some basic poker rules apply to Chinese poker. It is a little different than normal poker game in which earnings are mostly dependent on a players skill and a bit of luck whereas in Chinese poker, it is mostly about luck and very easy to play.
Edit: Dont know any Bitcoin sites that offer Chinese poker.