You're asking in which I am assuming you want to say Happy Birthday to someone who is audibly impaired? In which case, you may need to be more specific as there are lots of different "languages" of sign language. Usually depending on which country you are from.
Sorry I didn't realise it was out of the American sign language folder. My apologies!
happy 18th
13
Grattis på födelsedagen
Birthday in Spanish is "cumpleaños" (singular or plural noun). Happy Birthday! = ¡Feliz cumpleaños!
"Happy birthday" in Punjabi is spelled as "ਜਨਮ ਦਿਨ ਮੁਬਾਰਕ" (Janam din mubarak).
In Spanish, "Happy Birthday Pedro" is spelled as "Feliz cumpleaños Pedro." You can use this phrase to wish someone named Pedro a joyful birthday celebration.
Ra Whanau ki a Koe
Spell PATH, then show a path with both your hands
http://www.fineorient.com/images/productimages/happybirthday_main.jpg
¡Feliz Cumpleaños!
hair, dirt, pray, bird, data, tidy
It's translated "Feliz cumpleanos; eres maravilloso" in Spanish.