I just fetched a new book, and as I wanted to hyphenate it, there appeared the message: "The book's language is unknown", although, in the content.opf I find this:
Code:
<dc:language>de-DE</dc:language>
Could someone, please, tell me how to set the language correctly in order to make the plugin work. I slightly remember that someone has already put the same question, but I just can't find it (sorry, and many thanks!).
Problem solved: It's sufficient to set the language in the "Edit Metadata" section.