found some Chinese translation files which last updated at 13-Nov-2011.
i guess translation progress more than the one come with game client. i saw all newbie quest was come with Chinese too.
anyone can read and need it can go to below link to download YGO550.ttf for font and xml.dat for translation

http://dl.dropbox.com/u/12203861/YGO550.rar
http://kuai.xunlei.com/d/XCVAGKFXBJPU

change directory to ..\BnS_CBT2\contents\bns\Fonts\
rename or backup original YGO550.ttf and copy downloaded YGO550.ttf to ..\BnS_CBT2\contents\bns\Fonts\

http://dl.dropbox.com/u/12203861/xml.dat
http://kuai.xunlei.com/d/XVASPDXUVTTD

change directory to ..\BnS_CBT2\contents\data\
rename or backup original xml.dat and copy downloaded xml.dat to ..\BnS_CBT2\contents\data\

after done above 2 step, your game client should change to chinese

This post has been edited by ivanting89: Feb 13 2012, 07:54 AM

the translation was made for BnS Atomix as some Chinese do found that 1st private server, i guess some of them in game was come from mainland. That font i was upload is for Simplified Chinese, which you might had to set your Language for non-unicode Program to Chinese (PRC) i guess.