[BUGFIX] Flaky child references handling for pages_language_overlay

IRRE records have to point to their specific localized parent record.
This works in general for tables containing records of the default
language as well as localizations. For the "pages" table this look-up
has to be extended to query from "pages_language_overlay".

Change-Id: I84b6ee9304f85222430a5bdf62bd2271aae68fd5
Resolves: #76174
Releases: master, 7.6
Reviewed-on: https://review.typo3.org/48495


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Reviewed-by: Susanne Moog <susanne.moog@typo3.org>
Tested-by: Susanne Moog <susanne.moog@typo3.org>