update sl translation
update sl translation

Change-Id: Ia8e406703138748a7c45e1898cd583b4f57454ac
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/296357
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>

sfu/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,sfu/canvas-lms