update sl translation
update sl translation

Change-Id: I0bef408fa735cd7c3596c19f45182c161f604fb7
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/279062
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