I have been to Karup, and I used to hear a lot of jokes about Arhus.

Plain guage means the thickness of the metal is the same end to end.
Chr-Mo tubing is an alloy of steel, commonly grouped into a classification once known as HSLA, or High Strength Low Alloy. It's good stuff.
Tange 5 is the level of tubing, I had a great bike made with Tange 5, a Shogun.
The frames are light, well-made, and generally have excellent paint.

I'd say, in words you can understand, "cool."