Official English text from the Liturgy of the Hours:
O Emmanuel, king and lawgiver, desire of the nations, Savior of all people, come and set us free, Lord our God.
Official Latin text:
O Emmanuel, Rex et legifer noster, exspectatio gentium, et Salvator earum: veni ad salvandum nos Domine Deus noster.
More literal English translation:
O Emmanuel, God with us, our King and lawgiver, the expected of the nations and their Savior: come to save us, O Lord our God.