Afaik, no added content. The graphics were a bit reworked, but in contrast to Suikoden II, only the sprites and not the avatars. http://blog.hardcoregaming101.net/2010/ ... koden.html
No translation available. The data structure of the PC and PlayStation version are similar, though, so if you have some programming skills, I think inserting the PSX translation into the PC version should be doable.