how to change to chinese language for this game?

[Mono_monk]

I only have English and other 2 non-chinese language selection in the config menu

[Autumn]

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NOTICE
For text displayed within the game, you can select any of the following languages:
- English
- French
- German
- Chinese (Traditional)
- Chinese (Simplified)
- Japanese

How to select the display language
1. From your game library, right-click the game title, and then select Properties.
2. After selecting the LANGUAGE tab, select the language you want to use from the menu.
* Select "ENGLISH" here if you want to play in "GERMAN" or "FRENCH"
3. After selecting the PLAY button, from Configuration, launch the configuration tool.
4. If a language configuration item exists within the tool, select the language you want play in.

Concerning save data, note that data is separated into the following 3 groups:
- English, French, German
- Chinese (Traditional), Chinese (Simplified)
- Japanese

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Taken from the store page.

[DCRage]

If you're asking about voices/speech in the game, only English & Japanese (Japanese is a free DLC).