update fa translation
update fa translation

Change-Id: If63bda60f004dd5209e9ad9a969f319338f0e652
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/243076
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>

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