I not only have the latin words, but their translation. If no one has gotten back to you already on this and you still need them:

Chorus:        Gaudette, gaudette Christus est natus
                  Ex Maria virginea, gaudete
                  Gaudette, gaudette Christus est natus
                     Ex Maria virginea, gaudette

Tempus ad est gratiae hoc quad optabamus
Carmina laetitiae devote redamus

Dues homo factus est naturam erante
Mundus renovatus est a Christo regnante

Ezecheelis porta clausa per transitor
Unde luz es orta sallus invenitor

Ergo nostra contio psallet jam in lustro
Benedicat Domino sallus regi nostro