update en-CA translation
update en-CA translation

Change-Id: I87916b5a31e4612211e2fc25909df7ee475b33bc
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/262661
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>

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