Update nb.js

There are dots after month day in norwegian long date formats, just as ordinals.

A valid LLLL in Norwegian Bokmål is: onsdag 21. august 2013 13.00

Actually, the HH:MM should be HH.MM with a dot as separator, according to standards (at least last time I checked), but people are increasingly using HH:MM with a colon.

In addition, the language flows better if "klokken" is taken away from all places noted. Should I create a new pull request for this?