use add extra text helper in reports

refs CNVS-3134

test plan 
 - report extra text should be translated and work

Change-Id: Id4489f386c35f4df999e993306d64a7563573773
Reviewed-on: https://gerrit.instructure.com/34685
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Dave Jungst <dave@instructure.com>
Product-Review: Rob Orton <rob@instructure.com>
QA-Review: Rob Orton <rob@instructure.com>