Russian translation doesn't apply on anything from the mod.
I'm using version 1.6.1 for Fabric 1.20.1

Maybe ru_ru.json is corrupted.

It works fine for me. Double check that you selected Russian and not Russian (Pre-revolutionary), and if that is fine please send the log to check for suppressed errors.

Double checked that I definitely have not pre-revolutionary Russian.
Here's the log.
latest.log
Maybe the problem is that I have about 400 mods…? 🧐
Although, recently the translation in your mod worked fine. However, after one of my modpack updates via Modrinth, the translation suddenly disappeared, and noteworthy that only in your mod.

Very weird. languagereload is the only mod I would guess having an influence on language loading at all, and Armors is using a classic asset pack for languages so this should not be an issue.

Btw your physics mod is suffering, it probably degrades your performance a bit when it keeps throwing exceptions like that.

It's really very weird.
Especially because I just downloaded the mod file again and everything worked fine!
The problem was a comma instead of double quotes at the end of ru_ru.json, which literally came from nowhere. I really wonder where.
Thus, I close this phantom issue.

As for physics mod, I have 40-50 fps with Complementary Shaders.
Just took a look at the errors and… I can't parse them for myself.
Yep, there used to be crashes due to a ragdoll creation error for some mobs deep down in a caves, but now they seem to be gone.