Hi Iņigo,
You know, in russian forums people try to figure out why hyphenation doesn't work for russian books, although it works fine for english ones. You put hyphenationPatterns.zip into _fbreader\share\zlibrary folder so I assume you tried to make it work. Could you please advise what could be an issue?
Just in case here are links to some text in russian:
http://fictionbook.ru/author/chehov_...wnload.fb2.zip
http://fictionbook.ru/author/chehov_.../download.epub
Thanks,
Loo