update sl translation
update sl translation

Change-Id: Id98f2d4e628e5e020a0172fa0087771bfbade4d1
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/278949
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