spec: stub test translations

fixes sporadic i18n failures (due to unexpected translations persisting
across tests)

Change-Id: Id7f4f13d8d789797b60c5492e5d37ae8e6aae34e
Reviewed-on: https://gerrit.instructure.com/38606
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Bryan Madsen <bryan@instructure.com>
Product-Review: Bryan Madsen <bryan@instructure.com>
QA-Review: Bryan Madsen <bryan@instructure.com>