Added hierarchy_parent_title to facets
National: added 2 images for collection highlights
Added support for translating hierarchical facets with trailing slashes (slashes are stripped before translation). Added missing translation for Sound/CD.
Temporary alternative translations for JYU/Kokkola
AJAXified RSS template.
Added cleaning up of hierarchical facet display value when translation is not available.
Merge branch 'master' of https://github.com/KDK-Alli/NDL-VuFind