no-jira: Wording

src/main/java/org/olat/modules/opencast/ui/_i18n/LocalStrings_de.properties

@@ -32,5 +32,6 @@ event.title=Titel
 select=Ausw\u00E4hlen
 series.contributors=Mitwirkende
 series.description=Beschreibung
+series.identifier=Identifier
 series.subjects=Betreff
 series.title=Titel

src/main/java/org/olat/modules/opencast/ui/_i18n/LocalStrings_en.properties

@@ -32,5 +32,6 @@ event.title=Title
 select=Select
 series.contributors=Contributors
 series.description=Description
+series.identifier=Identifier
 series.subjects=Subjects
 series.title=Title