[TASK] Add functional test covering copying a page translated in free mode

This test is a safe net before implementing features like l10n_source

Releases: master, 7.6
Resolves: #79126
Change-Id: I89f5b819735623a33468a8e5898a1b7825aa0c9b
Reviewed-on: https://review.typo3.org/51082


Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Morton Jonuschat <m.jonuschat@mojocode.de>
Tested-by: Morton Jonuschat <m.jonuschat@mojocode.de>