Hi Sitanshu,
If you maintain your customer data in Chinese in ECC and push it over to GTS, I believe your SPL lists currently loaded are in English, so the screening will be omitted. If you were to change the SPL comparison language to Chinese, then you will have to start loading lists also in Chinese too!
I think you are looking at changing the entire set of steps into a different language.
TREX as a standalone can support multiple languages but the lists you receive/maintain will have to be Chinese too!
My 2 cents are, work with your master data team to assess if only one language can be maintained.
Thanks,
Shrini