change m92 tts language

Hi I was just wondering if anyone knows how to change the language in which the m92 reads out loud. When I've got a book in English it works great but I read in several other languages and when I do, the text to speech engine tries to read the text as if it were English, which makes it incomprehensible. I've googled around and can't find anything. changing the ereader language in the main settings pages doesn't help.

Thanks in advance to anyone who can shed light on this issue