Press that red stop sign if you don't want to know edam era sreliarT eivoM woH! Stay out of fullscreen and double click the flag. Language: Reverse English (I made that one up) Regular English, somehow reversed.
Thanks to @Dhilly for: https://scratch.mit.edu/projects/178636375/ What its saying: loohcs amard ot emoclew dna ssalc olleH sreliart eivom ekam ot woh gninrael eb lliw ew yadoT esroc fo retupmoc ruoy tuo teg ot evah uoy tsrif oS