This is the standard Turkish way to say "Happy Birthday." It literally means "It is good that you were born." Melisa: The person's name.
The phrase you provided is in Turkish and translates to Iyi Ki Dogdun Melisa Isme Ozel
"İyi ki varsın Melisa, doğum günün kutlu olsun!" (It's good that you're in my life Melisa, may your birthday be celebrated!) This is the standard Turkish way to say "Happy Birthday