How do you write happy 50th birthday in French?

Bon quarantième anniversaire en retard! and Joyeux quarantième anniversaire, même tardif! are French equivalents of the English phrase "Happy belated 40th birthday!" Birthplace and personal preference determine whether "Good 40th birthday late!" (case 1) or "Joyous 40th birthday, even (though) tardy!" suits. The respective pronunciations will be "bo keh-raw-tyeh-ma-nee-ver-ser aw ruh-tar" and "jwa-yuh-za-nee-ver-ser mem tar-deef" in French.