"Unmodded" tag is translated as "Χωρίς εποπτεία", as you can see here https://www.twitch.tv/directory/all/tags/532af76e-eabd-451e-9709-cd1cc7653edb which means "without moderator/supervision" in the Greek language.

However, on this page, https://www.twitch.tv/directory/all/tags is described as "For streams that feature gameplay from an unmodified version of a game".

My suggestion is to change it from "Χωρίς εποπτεία" to "Χωρίς τροποποιήσεις", which means "without modifications".