Can someone provide information because the product description doesn't show Simplified Chinese or Traditional Chinese that Steam has?
I bought the game seeing its on sale here and steam. Not until downloading and launching it did I found that Chinese translation is not included in the GOG version(1.0.96). The steam annoucement said its included in version 1.1.108, so no now, I think future update will bring this about.
I hope the update will come to GOG version sooner.
EDIT: With GOG Galaxy installed I can update the game to version 1.1.108, which is identical to the steam version and includes Chinese translation. Version 1.0.97 is provided as a backup installer.