i18nema is needed on ruby 2.2

Change-Id: I6739abc4a1b7d23c747c5dcaa90190292af2dd8f
Reviewed-on: https://gerrit.instructure.com/46323
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Jon Jensen <jon@instructure.com>
Product-Review: Cody Cutrer <cody@instructure.com>
QA-Review: Cody Cutrer <cody@instructure.com>