Turns out Novigrad has tons of posters with mysterious text on them. Screenshotted almost half a dozen, currently trying to make sense of them.
One says "Kapygma Pimopideek", which doesn't seem to mean anything. I tried to identify the language with Google Translate - but the result was very unreliable. I really don't think CDPR would've put Somali text in the game.
Btw, I just got to Skellige, so if you can post some posters from Novigrad to decipher, that would be fun. I saved some images in the backlog as well.