update sl translation
update sl translation

Change-Id: Ib5f60a7295797f49c496d439cc816eebd54c2353
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/287010
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>

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