create Branch DDBNEXT-181
place links to dfg-viewer + object at institution differently on
item-detail-view
When directly linking to an item, show message "Treffer 1 von 1"
https://jira.deutsche-digitale-bibliothek.de/browse/DDBNEXT-181
https://jira.deutsche-digitale-bibliothek.de/browse/DDBNEXT-182
invent white borders in ddb.css
make navigation-links in item-details view darker
remove unnecessary class=row
Merge remote-tracking branch 'origin/DDBNEXT-181' into develop