Sto Lat!
And to sing Happy Birthday:
Sto lat, sto lat, niech zyje zyje nam.
Sto lat, sto lat, niech zyje zyje nam.
Jeszcze raz, jeszcze raz, niech zyje, zyje nam.
Niech zyje...
Herzlichen Glückwunsch zum Geburtstag. (literally heartfelt congratulations for your birthday) Alles Gute zum Geburtstag. (literally all the best for your birthday) It's also not too uncommon to...