update sl translation
update sl translation

Change-Id: Ia92a1e72eb0988f02d6d93da775fc70a5d5bf846
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/292485
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>

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