Best wishes for a good week at the end of the mass?

The concluding rites of the holy mass in the ordinary form are somehow like this : > *If they are necessary, any brief announcements to the people follow here.* > > *Then the dismissal takes place. The Priest, facing the people and extending his hands, says:* > The Lord be with you. > > *The people reply:* > And with your spirit. > > *The Priest blesses the people, saying:* > May almighty God bless you: the Father, and the Son, and the Holy Spirit. > > *The people reply:* > Amen. In several parishes, I attend or have attended mass in (in Germany), the priest wishes the congregation a good Sunday and a successful week (with only slightly varying wording). The people respond with "Thank you, the same to you!" (German: "Danke gleichfalls.") This typically takes place directly before "The Lord be with you" and is so prevalent and so highly formalised that a lot of catholics I encounter think this is an normal part of mass like the blessing or the ite missa est. My Question is: 1) How widely spread is this custom in other parts of the world? 2) Are there information of how this custom started and whether some (magisterial) voice explicitly condone or forbid it.