Update nb.po

HRN
Unused CSS
Unescaped HTML in shared-note list
Unescaped HTML in repository list
Unescaped HTML in source list
Unnecessary RTL formatting breaks RTL layout
Correct media title and the media thumbnail spacing
Don't show registered timestamp when it does not exist
Remove bolding from title on media thumbnail
Merge branch 'master' of https://github.com/fisharebest/webtrees