Hi, I can add this translation to the official Shcherbin if you vouch for its quality.

Hi Magistr-Djo, thanks for the offer — please go ahead and include it. I can vouch for the quality: it covers all keys in the English source, follows vanilla Factorio's Japanese terminology, and reads naturally.
Feel free to use it as-is, no attribution required.
I'm happy to keep it updated as new strings are added, and I'll deprecate my standalone mod once it's merged. Thanks!

Hi, I'll add it in the next update.