update nl translation
update nl translation

Change-Id: Id87ca39a48a956b5982d36863af7809a7b42f1d9
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/253311
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>

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