It's unclear whether the statement in post #1 is referring to the installer or the installed system, and how much this is a Devuan issue or a Debian one, but seems to be it's definitely not referring to this forum.

This Debian page says the Russian translation is 90% complete, and there is a page written in Russian at //wiki.debian.org/ru/L10n/Russian which might be relevant to increasing that percentage.

If the issue is actually Devuan-specific, more details would be required.