From the File Cabinet of Artemis Fowl -* Chapter 1- the First Folder *-

I have finally found my car keys, and I am now in the Paradise Hotel. Why they call it a "paradise", I'll never know, for it is a terribly run- down place.
On to the first folder. This consists of nothing more than a letter addressed to Angeline Fowl concerning her son's friendships and such at school and in general, a copy of the song "Friends Are Always There" with only the notes B, A and D marked in and the signature of a person called "Marsha" at the top, a full package of gum with "Ha ha ha, just kidding" written on it, and what looks like an empty birthday party loot bag with the name "Marsha" on it. *scribbles on a scrap of paper* There, I've just made note of the name "Marsha", and how commonly used it is in this folder. The title is "Nb 'Uirvmw' Nzihsz", which I cannot understand.
I also cannot understand the letter. Who it's from is obvious because it says so there, but the rest of it is written in what I think is Norwegian or Dutch. For example, it started with "Kjær Angeline,", which is obviously "Dear Angeline,". But the first few lines are impossible to understand. Here is an excerpt from the letter:

"Kjær Angeline,
Jeg mest angår med Deres ung sønn, Artemis, for han er en bra bit antisocial. Jeg ber om Deres hjelp ved forståelse av ungdomen slik kanskje dette forholdet er fast.."

The letter continues on in this language. From this excerpt I can see that it is to Angeline, is about her son Artemis, and something to do with "antisocial", "bra", "bit", and "fast". What I have guessed is the correct translation(or a translation), off the top of my head, is:

"Dear Angeline,
You son, Artemis, is antisocial because he wears bras and is a bit fast."

This translation is most likely to be inaccurate, however, it is all I can figure out for now, if I just happen to be going in the right direction. If I have any more luck with this folder, I shall keep you all posted. Farewell until then, and wish me luck with both this folder and the next.