Russian translations of FreeBSD manual pages.

This package installs translated manual pages into share/man/ru.UTF-8
The translations are tracked per FreeBSD version via separate
flavors.  Choose the flavor matching your FreeBSD release:

  - current  for FreeBSD main branch (CURRENT)
  - 15_0     for FreeBSD 15.0
  - 15_1     for FreeBSD 15.1
  ...
  - stable15 for FreeBSD stable/15 branch (STABLE)
