update en-CA translation
update en-CA translation

Change-Id: Ib0b7dfeadec67a297640a1c77c0e44785f3590d8
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/274462
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>

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