add property for translator

Author: qqmyers

src/main/java/propertyFiles/citation.properties

@@ -295,6 +295,7 @@ controlledvocabulary.contributorType.research_group=Research Group
 controlledvocabulary.contributorType.rights_holder=Rights Holder
 controlledvocabulary.contributorType.sponsor=Sponsor
 controlledvocabulary.contributorType.supervisor=Supervisor
+controlledvocabulary.contributorType.translator=Translator
 controlledvocabulary.contributorType.work_package_leader=Work Package Leader
 controlledvocabulary.contributorType.other=Other
 controlledvocabulary.authorIdentifierScheme.orcid=ORCID