[Backport] Removed comma(,) from translate attribute

[dmytro-ch]

Original Pull Request

#14363
There should be space instead of the comma(,) for separating two tag name inside the value of translate attribute.

Fixed Issues (if relevant)

N/A

Manual testing scenarios

N/A

Contribution checklist

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds on Travis CI are green)

[rogyar]

Hello @dmytro-ch. Please, implement recommendations from the #15615.
Thank you

[dmytro-ch]

Thank you @rogyar. I've applied the changes.

[magento-engcom-team]

Hi @dmytro-ch. Thank you for your contribution.
Changes from your Pull Request will be available with the upcoming 2.1.15 release.