edit course deletion confirmation text
edit course deletion confirmation text

test plan:
* click to "permanently delete" a course
* check that the confirmation message reflects
the updated language in the ticket

fixes #CNVS-5268

Change-Id: I0319d34e00559b2123362ed2900e4c435df45e2a
Reviewed-on: https://gerrit.instructure.com/20290
Tested-by: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@instructure.com>
Reviewed-by: Jeremy Stanley <b3f594e10a9edcf5413cf1190121d45078c62290@instructure.com>
QA-Review: Adam Phillipps <0e18f44c1fec03ec4083422cb58ba6a09ac4fb2a@instructure.com>
Product-Review: Matt Goodwin <7c47e89894930304a2cdfa1d2ccca1e1eddb893d@instructure.com>

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