(you male) felice di essere tuo amico / (you female) felice di essere tua amica
If you want to say happy retirement in Italian you would say, pensione felice. You would say good luck by saying buona fortuna.
"Happy birthday with love to my female friend!" in English is Buon compleanno con amore alla mia amica! in Italian.
Buon Compleanno amico mio
amicizia
Buona Pasqua
Buon compleanno!
felici percorsi
buon tacchino
Simply say "Happy Mother's Day."
"Happy Birthday to my friend Barbara! Love you!" in English means Buon compleanno alla mia amica Barbara! Ti voglio bene! in Italian.
40th birthday
To say "happy birthday" to a male friend in French, you would say "Joyeux anniversaire, cher ami" which translates to "Happy birthday, dear friend."