We currently use v7.0.28.
Complete your survey as per normal in English.
In this version, under the File menu option, there is a Translation / Export Text for Translation option. There is a range of languages to select from. Select English to Chinese. Export you .xlf file.
The .xlf file can be sent to a translation house / company who specialise in this procedure. They then perform the translation using their own software and you import it back into Sawtooth under the File / Translation / Import Translated Text option.
Now you have the survey in Chinese. I recommend someone with knowledge of the Chinese language thoroughly checks the survey.