Updates to norwegian translation

I noticed there were some misspellings and grammar errors which I corrected. Especially the sign in-message, it went along the lines in norwegian as: "Draw yourself in", that doesn't make sense now does it.

Also removed some unneeded capitalizations, norwegian grammar is all about that and how you build a word. Most words can be combined into one, like in english: "Door handle" would be "Doorhandle" if english was using norwegian grammar rules.
Merge pull request #1130 from Nichiatu/patch-1

Updates to norwegian translation