"Εμείς μιλάμε στο chat."
Translation:We are talking on chat.
This is a gray area. Normally, we don't mix alphabets... I mean we don't use English words (chat) in a Greek sentence on Duo. But it happens that in Greek we use the English word..."Chat" and write it in English.
This will be corrected in the new Tree. And sorry for just seeing this post.