According to this page
http://www.romhacking.trd.br/index.php?action=printpage;topic=2260.0 a lot of MVS carts got official portuguese translations. I pointed Guru to this as I didn't find any hint about these in the undumped list but now that this wiki appears to have replaced the old list and I didn't find it in there either I'd wanted to point you to this. There is no evidence but the other games mentioned on that page are authentic so it is very likely the info is correct. At least a note about these and some farther research wouldn't hurt.
CPS2-games are also listed and while some of these are dumped others are not. I don't know if the CPS3-games are in MAME yet.