Server death message - mob names

So, minecraft server send the java name for deathmessges and let the client convert it into normal text, right? ok, it does that, but not for mob names, just for the deathmessages theyselfs, exemple: in pt_BR it should say something like "Player foi morto por Zumbi" but it shows "Player foi morto por Zombie" Sorrry if this is a duplicate, i searched and didn't found nothing