Add sub nav partial for dryer navigations
Use sub nav for peacekeeping sub navigation
Merge pull request #88 from okfde/sub-navigation

Sub navigation
Add Headline to Data explanation
Merge pull request #89 from okfde/daten-text

Überschrift für Datenbeschreibung hinzugefügt
Change country labels from english to german
Merge pull request #90 from okfde/country-names

Ländernamen auf Deutsch
Add X-axis back to linegraph
Merge pull request #91 from okfde/linienaxen

Add X-axis back to linegraph
Merge branch 'master' into sicherheit-sub-score