1312: Implement initial vocabulary browsing mechanism

Task-Url: https://pm.winseda.de/issues/1312

messages_de.properties

@@ -453,6 +453,7 @@
 ~eu.dariah.de.minfba.search.view.dataset.available_datasets                                     = Verf\u00FCgbare Datenquellen
 ~eu.dariah.de.minfba.search.view.dataset.label.additional_data                                  = Zus\u00E4tzlich geladene Daten, Dokumente und Medien nach Spezifikation in der DME.
 ~eu.dariah.de.minfba.search.view.dataset.label.document_count                                   = Dokumente, die \u00FCber den konfigurierten Endpunkt verf\u00FCgbar sind.
+~eu.dariah.de.minfba.search.view.filter.more                                                    = weitere...
 ~eu.dariah.de.minfba.search.view.filters.location                                               = Ort
 ~eu.dariah.de.minfba.search.view.filters.subject                                                = Genre
 ~eu.dariah.de.minfba.search.view.item.additional_data                                           = Weiterf\u00FChrende Daten

messages_en.properties

@@ -333,6 +333,7 @@
 ~eu.dariah.de.minfba.search.view.dataset.available_datasets                                     = Available datasources
 ~eu.dariah.de.minfba.search.view.dataset.label.additional_data                                  = Additionally loaded data, documents and media as specified by means of the DME.
 ~eu.dariah.de.minfba.search.view.dataset.label.document_count                                   = Documents that are available through the configured endpoint.
+~eu.dariah.de.minfba.search.view.filter.more                                                    = more...
 ~eu.dariah.de.minfba.search.view.filters.location                                               = Location
 ~eu.dariah.de.minfba.search.view.filters.subject                                                = Subject
 ~eu.dariah.de.minfba.search.view.item.additional_data                                           = Additional Data