Actually, it has. In TMP and TWOK there was background radio chatter and on-screen references to Franz Joseph designs, leading many (such as myself) to believe that FJ's work was accidentally recanonized, countering Roddenberry's original orders.Not the first time that has happened on a TV show. Not sure if it has happened with trek before.
If they think whatever text is there is going to be illegible on screen they'll just put any ol text there.
Judging by the size of the font, I doubt it would have been readable.