After Vatican II they ditched the Latin Mass and came up with the Novus Ordo (new order) Mass, turning the priest to face the congregation and making some very loose translations of the liturgy into the native languages of the people. I know that fairly recently, during the Pontificate of Benedict XVI, more changes were instituted, aimed at rolling things back a bit. A number of new translations were made, ostensibly to bring them closer to their original, pre Novus Ordo state. I’m pretty sure the version of the Nicene Creed I linked from the USCCB website is from that most recent revision.