update fa translation
update fa translation

Change-Id: I26b5ea87ba935b74e242d65c39b26909f7285140
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/288985
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>

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