"Bishop Thomas John Paprocki, Bishop of Springfield in Illinois, has asked that prayer cards with the Prayer to St Michael be placed in the pews of every church and that the prayer be said publicly at the end of every Mass before the recessional hymn."
Here is the translation used in England and Wales (in the US they have a slightly different one):
Holy Michael, Archangel, defend us in the day of battle. Be our safeguard against the wickedness and snares of the devil. May God rebuke him, we humbly pray, and do thou, Prince of the heavenly host, by the power of God, thrust down to Hell Satan, and all wicked spirits who wander through the world for the ruin of souls. Amen.
H-t to Fr John Boyle.