Mirror change from D20825
@wblock was working on converting the docs to UTF-8, but efforts have stalled at the moment.
Ideally, if you want to make changes to the Russian translation, you'd find someone (other than me) who can mentor you for that language as a doc committer (or ask him/her to review and commit it).
I can only review the change for DocBook itself, but I can't comment on the language-specific parts. You could ask on the freebsd-doc mailing list if anyone is willing to help for that language. Thanks.