fix escaping in gradebook (Hide All on group), refs #3888
fix escaping in gradebook (Hide All on group), refs #3888

Change-Id: I74323aa57875b1da1838715874af56e8b850b7f0
Reviewed-on: https://gerrit.instructure.com/2414
Tested-by: Hudson <dfb64870173313a9a7b56f814c8e3b33e268497a@instructure.com>
Reviewed-by: Bracken Mosbacker <48b846001bca4166dc3fb7711563afc17525921e@instructure.com>

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