It actually is English, or at least identical to the way you would write it in English. “Ultras” is a term for certain football fan groups. Not all ultras are like this, but when you hear about shitty behavior by a team’s fans, it’s usually ultras. In this case, it’s IFK Göteburg’s ultras called Wisemen.

So it says “Ultras”, “GBG” (Göteburg/Gothenburg), and “Wisemen” (name)