Petr, the /lang/ folder in the book.zip has a lot of help files in wrong folders. This causes some confusion if the folder is just copied to the existing lang folder. Mainly there are folders missing, so not all help files are under /lang/xx/help/book/
Finnish is one of these, that might be my mistake somewhere, sorry At least also /de/, /id/ and /ja/. (There was no "book" module in the bug tracker, so I'm bugging you here...)
Book
Language files are missing folders...
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