There's also the name changes to the other characters.
Tina became Terra
Mash became Sabin
Biggs became Vicks

I know that Cyan's name was shortened. Cayenne, I believe was the original spelling. Since it's still pronounced the same way, it's not a big deal. I know Cait Sith was one of the espers but I can't remember his english translation. In fact, I believe the magic and espers had the greatest change but Walter pretty much explained why.

I never felt like they really changed Celes' suicide attempt. What was changed?