If I were a judge presiding over this case in a court, I would be struggling to contain my amusement.
You would have Paramount contesting that their incoherrent 'Klingon' phrases that were seldom used and which probably only the real die hard fans would ever even notice, has somehow undermined their alleged copyright. I doubt if even the actors that uttered the phrases could even remember what exactly they said now.
Irrespective of any legal issues, I somehow couldn't see Klingon type phrases on tees, being commercially viable. You would have to explain to observers that no, the printer wasn't dyslexic, or drunk when they made them. To younger observers you would have to explain what a Klingon actually was.