Warhammer Survivors lists Simplified Chinese text support for its Steam, PS5 and Nintendo Switch editions. This concerns interface or screen text, rather than a promise of Chinese voice acting.
Check Traditional Chinese availability in your installed version. The exact language-menu path is not verified here, so this page does not prescribe button presses that may differ between editions.
Chinese text by edition
| Edition | Confirmed text support |
|---|---|
| Steam full game | Simplified Chinese interface |
| PS5 | Simplified Chinese screen language |
| Nintendo Switch | Simplified Chinese |
| Nintendo Switch 2 | Simplified Chinese |
Check the product details for your account's region before purchasing if language support is a deciding factor. A supported language on one edition should not be used as a guarantee for every other storefront or demo build.

Check the game, not the store website
The language used by a store website is separate from the language available inside a game. Changing Steam's website to Chinese does not, by itself, establish or change the game's language support.
For the same reason, a Traditional Chinese option in Steam's website navigation is not a confirmed in-game language option.
When the expected option is missing
First identify whether you opened the demo or the purchased full release. Warhammer Survivors had multiple demo builds, and an old trial should not be used to judge every language feature in the full game.
Then check your installed edition and available updates. If the expected text option is still unavailable, report the edition, platform and problem text when asking for help. A screenshot of the actual language choices is more useful than a description of the store website's display language.
Do not assume a save-file edit or unverified launch command is necessary to enable Chinese.