On Greek translation, when u click the gear icon you have 2 options: 1) Αναφορά 2)Μύνημα
the 2nd has a typo. The correct is: Μήνυμα.
http://en.wiktionary.org/wiki/μήνυμα
Twitch is in the process of getting some updated, professional translations for some/all languages. You could submit it as a bug reports (http://www.twitch.tv/bug_reports/new) but as this forum is designed for API/SDK related question this is not the correct place to report it.