Actualy you need two rom files to get him to swear.
One for the CPU U6 gamerom and one for the soundboard U14.
By the looks of the eprom, you have the soundboard U14 eprom, which should be a 27C020.
The CPU eprom should be a 27C010.
The files are on the ipdb:
https://www.ipdb.org/files/2524/Williams_1991_Terminator_2_Judgment_Day_Profanity_ROMs.zip
Peter