machine-readable output from i18n autoimport task

refs CNVS-14225

Change-Id: I38cf5c2dbfae6f1812b7c0b6a866a8f55c2a76a7
Reviewed-on: https://gerrit.instructure.com/37686
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Jon Jensen <jon@instructure.com>
Product-Review: Brian Palmer <brianp@instructure.com>
QA-Review: Brian Palmer <brianp@instructure.com>