I've checked the md5 sums of all the files between the original and the patched game.
Three files are changed : rs5fe_p.dol, rs5mp1jpn_p.dol and main.dol.
In main.dol (and in rs5fe_p.dol, it's exactly the same file), at offset 0x005359B0, "ENGLGERMFRENSPANITALDUTCJAPN" is replaced by...