Is it supported by the Greek? Well in fact yes it is. The greek word translated in the Vulgate as gratia (grace) is Charis. In Ephesians 1:6 the Greek word Charis is the same word Translated by KJV as Grace (Strongs concordance # 5487). All same same. To work that hard to change Gods word cannot be good, no matter what you think of the Pope
And coming to her, he said, "Hail, favored one! The Lord is with you." (Luke 1:28 - NAB)
Better take this up, then, with the United States Conference of Catholic Bishops and the Vatican, who approved the Lectionary based upon this translation in 1998.