A slightly modified patch from Pierre Smits for "Improvement of Dutch localization in WorkEffortMgr" https://issues.apache.org/jira/browse/OFBIZ-5435

jleroux: Removed few duplicates en labels


git-svn-id: https://svn.apache.org/repos/asf/ofbiz/trunk@1551609 13f79535-47bb-0310-9956-ffa450edef68