[Translation] Improve nor-NO translation

Status: Reduced from 684 to 537 occurrences of unfinished translations (missing or not confirmed to be correct).


But, there is still 537 missing strings, and I won't be able to take them all, anyone willing to take a section? If so mention which context name(s) you want to take below so we don't work on the same things, for instance I won't touch the setup sections, so those are up for grabs.

How to do this on the same PR?
- On commandline, instead of the checkout step involving 'master' in ["Translating & Localizing eZ Publish using GIT"](http://share.ez.no/learn/ez-publish/translating-localizing-ez-publish-using-git/(page)/3), do this:
  ```git checkout -b my-nor-NO-changes upstream/localization-nor-NO-53```
- Then follow the article all the way until the "Pull Request" step, on this step make sure to select 'localization-nor-NO-53' as the target of the pull request.