'Empire Of Dreams' shows snippets of Jabba from ROTJ with the subtitles shown above, which according to my memory, is what i saw in 1983.
I still have an off-air copy of ROTJ taped from ITV in the UK in the 80s which has the original subs, so much so that some very dodgy panning was required to read the lines as they were spoken.
( I am new here, btw, but am a long term lurker. Hello!)