update en-CA translation
update en-CA translation

Change-Id: I6da21ca402dfa8aae7d9dbe3df0d3f979873fd46
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/282968
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>

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