The very first line of that conf file needs changing for Russian.It may be handier to invent a Russian user on your box, and su into it when you were dealing with Russian.
Some years back, the situation existed that patches required for full unicode support were being resisted by a few maintainers and hampering development. This has largely been overcome, but there was real debate over some of this.
A guy called Alexander Patrakov who is involved with linuxfromscratch.org did considerable work on bringing unicode support to a Russian LFS in particular, and you may do worse than look for something he has written.
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