Translation into English

Hello!
I've liked this song for a long time and tried to find out what it says, but no luck so far.
I'm not sure, but I'm guessing it's in Hindi (think I've recognised a couple of words) and I'd be really grateful if someone would write it down and translate it into English for me.
Also, if it's not much trouble, I'd like if someone could write it in Devnagri too besides Latin alphabet, so I'd know the exact pronunciation.
Thanks in advance!

Still no luck.
Does anyone at least know what language it is? I'll try to find someone who speaks it to help me out.