update en-CA translation
update en-CA translation

Change-Id: Ic92d537dbeb6e0292e0764934e142a88f1736302
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/280550
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>

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