kimbers asked: I have a friend in Germany and it's his birthday. How do you say 'Happy Birthday. I hope all your birthday wishes come true.'? Or, what are other popular German birthday greetings?

“Alles Gute zum Geburtstag. Ich hoffe, dass alle deine Wünsche in Erfüllung gehen!” That’s the translation. :)

Alles Gute zum Geburtstag / Herzlichen Glückwunsch zum Geburtstag are the most common birthday greetings.