Well done, but vela havle is not shortened here, its an expresion of surprise in vernicular bosnian - specifically in this case, disbelief like "how come it's morning already" referring back to satan's promise that s/he will sing till dawn (sabah). Your translation is great, but there is subtextual meaning embedded in the lyrics that plays on cultural meanings beyond the surface meaning. I myself get it only after spending time with muslim grannies in the streets of Sarajevo :) its sooooo dense with meaning, that much of it is purposely obscure arabic/turkis influenced archaic bosnian ways of talking, which is cool, but the fact that it actually has a good story makes it brilliant. I mean, it's not just obscure for obscurity's sake.