lycklig födelsedag - As far as I know that says 'happy birthday' in Swedish... (Thanks internet, but can someone tell me if that is it? haha I don't want to say 'fuck you!' or something bad)
literally, yes, (so you don't have to worry about offending anyone ) but we don't say that. what you're looking for is "grattis på födelsedagen" ("congratulations at you birthday").