As you know, many of us use archive.org to OCR their books: https://en.wikisource.org/wiki/Help:DjVu_files#The_Internet_Archive For a while, they've been stuck with FineReader 8.0. I've just noticed the last OCR processes use 9.0, which has 5 more languages and 2 more dictionaries: http://www.abbyy.com/support/finereader_90_ts/RecognitionLanguages/ http://www.abbyy.com/support/finereader_80_ts/RecognitionLanguages/
I think it's worth re-doing OCR on any archive.org DjVu you're using (and you definitely must do so if it's one of those languages). I'm a (limited) admin there, so feel free to give me on my talk lists of items where to update OCR: https://wikisource.org/wiki/User_talk:Nemo_bis
Nemo