Changing to Chinese Audio

I was going thru the gwdat and I stumbled upon many chinese audio bits for factions (I believe). And I am wondering is it possible to change the audio to chinese in game. I did not see it and I tried use same audio as text and switched to chinese still no luck... Was this option in the game earlier and taken out? I read of one person playing thru factions with the chinese audio...

Any help?

If it was taken out, any help on how to restore?

I think it may be changed depending on what area you choose you're from when registering the game. Just my thoughts, though, but something to consider.