As promised in the v1.28 and v1.29 notes: the free DLC "High-Quality Chinese Pack" has passed Steam's review and is now live. It upgrades translations into Simplified Chinese with a small local language model that runs entirely on your PC, offline, at no cost.
How to get it: open the DLC's store page and add it to your library like any free DLC, then let Steam download it (about 1.3 GB). In the app, open Settings, choose Chinese (Simplified) as the target language, and pick the high-quality Chinese engine; there is also an "Install on Steam" button in Settings that takes you to the DLC page directly. The model was already wired into the app since v1.27, so no app update is needed.
What changes: Chinese translations become noticeably more natural, especially for longer dialogue lines and story text, because a local language model rewrites the raw machine translation with context. It runs on your GPU via Vulkan (NVIDIA, AMD and Intel all work; in our measurements a short line takes about 105 ms on an RTX 3060) and falls back safely if your PC cannot run it. As always, everything stays on your PC: no cloud, no account, no extra fees.
NOTE: This pack only affects translations into Simplified Chinese. If you tried the app before and refunds burned you on Chinese quality, this update is for you; we would genuinely appreciate a second look. Feedback in the discussions helps us tune it further.