Mods, language files, and Thai
Steam tags Japanese Ramen Simulator as Moddable. I could not find a Workshop tab in the store categories, and no patch note announces a mod kit or official documentation. If you need a Nexus Mods page, I have to say it is unconfirmed: the site blocked the check.
What players are actually sharing
Discussion titles ask how to upload a Russian language replacement and whether Russian will be added. That is a file-swap conversation, not a studio pipeline. A player guide points at %USERPROFILE%\AppData\Local\RealRamenSimulator\Saved\SaveGames\ for worlds, and My Designs uses a PNG folder. I am not turning those clues into install steps. The language-pack method was not verified file by file.
Thai
The supported-language list is English, French, Italian, German, Spanish, Brazilian Portuguese, Simplified Chinese, Traditional Chinese, Japanese, and Korean. Interface only: no full audio and no subtitle track. Thai is not on that list. There is no official mod framework to hang a Thai patch on. A community language swap, if you find one, is a modified file with the usual risk that the next patch overwrites it. This page does not host the file.
Trainers
Cheat tables are circulating on trainer sites. I am not linking or mirroring them. Early Access shipped three patches in eight days, which is enough to stale a memory table. The legal copy is the Steam build at the price on the download page.
The roadmap I read does not promise mod tools. My Designs and the later My Sounds feature are official customization, which is a different thing from a mod loader.