Allow translated properties for variant reporting experts

see https://jira.gsc.wustl.edu/browse/AT-556

This change is needed for the RNAseq report. While testing this change I also found bugs with the report and other components that were fixed as part of this pull request.
This situation shouldn't occur. The existence of the properties specified in the plan file is checked during plan validation (*_errors subroutines in this file) before execution. 
@davidlmorton What's your opinion?