[TASK] Remove hard-coded l10n_parent fields for pages

Due to the change of the pages_language_overlay migration, a lot
of hard-coded "l10n_parent" and "sys_language_uid" fields for
pages have been introduced.

This should be changed into a common function in DataHandler
and the TCA option should be used instead.

Resolves: #83013
Releases: master
Change-Id: I43a33aac1015436109d1ca7b3ea200c78d2a2fb9
Reviewed-on: https://review.typo3.org/54664


Reviewed-by: Susanne Moog <susanne.moog@typo3.org>
Tested-by: Susanne Moog <susanne.moog@typo3.org>
Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>