læl is a way of expressing laughter, as in lol. The only difference is o being replaced with the scandinavian letter æ. Some spell it lael because only scandinavian keyboards include the æ-button.
The two other scandinavian letters are øand å. Their order in the alphabeth is: ÆØÅ, and they're simply an extension to the all so known English alphabeth (A-Z).
John: Where did Willy go?
Mark: I guess he has to clean his room again..