Who changed the Fatima prayer?

From the Fatima prayer we read where Mary says: > I want you to continue saying the Rosary every day. And after each one > of the mysteries, my children, I want you to pray in this way: O my > Jesus, forgive us our sins, save us from the fire of hell. Take all > souls to heaven, especially those who are most in need. Now that part in Rosary has changed to: > O my Jesus, forgive us our sins. Save us from the fires of hell. Lead > all souls into heaven, especially those in most need **of thy mercy**. > Amen. What is the history of the added: **of thy mercy**. This was also added in other languages not just English.