Accessibility facet
Merge branch 'develop' of
https://github.com/Deutsche-Digitale-Bibliothek/ddb-next.git into
develop

Conflicts:
	grails-app/i18n/messages.properties
	grails-app/i18n/messages_de.properties
DDBNEXT-627, DDBNEXT-460 done
DDBNEXT-627, DDBNEXT-460 done
Merge branch 'develop' of https://github.com/Deutsche-Digitale-Bibliothek/ddb-next.git into develop