Saw this as I was passing a shop in Koplik yesterday.
Although most shops use the words "hapur" (open) and "Mbyllur" (closed) this shopkeeper uses a different word. I take it that it means "i çelur" which means open...but the shopkeeper has written it in Shkodrane "çilun".
"Hajde" means "lets go" or "come on" in Serbian or Croat.In this instance it would mean "come" or "welcome".