Untranslatable string "optional"

[jernejh]

Preconditions

Version: Magento 2.1.1

Steps to reproduce

1. When entering personal data during the checkout (if email matches with the user account)

Expected result

1. The word optional should be translatable, but is not - no such string was generated with magento i18n:collect-phrases tool

Actual result

[sevos1984]

Thanks for reporting, internal ticket created MAGETWO-58378

[magento-engcom-team]

@jernejh, thank you for your report.
We've created internal ticket(s) MAGETWO-58378 to track progress on the issue.