update sl translation
update sl translation

Change-Id: Ic9173dd9d28f3636949e7d9219aa60950a87be41
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/297640
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>

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