add Persian (fa-IR) crowdsourced language

closes CNVS-14232

test plan: enable translations, change your language to fa-IR, and
verify translations are displayed

Change-Id: I9bd726bd0f3d1287b4c3c48823ca5b3f69cbc891
Reviewed-on: https://gerrit.instructure.com/37829
Reviewed-by: Cody Cutrer <cody@instructure.com>
QA-Review: Jeremy Putnam <jeremyp@instructure.com>
Tested-by: Jenkins <jenkins@instructure.com>
Product-Review: Brian Palmer <brianp@instructure.com>