If Spokojnoj Noći is supposed to be Serbo-Croatian it's just a tiny bit off. It's the dative of it, the nominative should be Spokojna noć. But either way we just say Laku noć or Prijatno so there's that. I really don't wanna seem like an asshole but grammar is insanely important to me because I love languages too much. Just thought I'd correct that if it even is Serbo-Croatian