update fa translation
update fa translation

Change-Id: I58d52e266f3648445076e0b393fffc0e169e0b1d
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/247085
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>

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