[BUGFIX] allowLanguageSynchronization fails for 2nd level translations

2nd level translations are not considered yet with the feature to
synchronize languages either from parent or source language records.
This change modifies the creation of the language state as well as
switches "custom" states to "source" states of a new second level
translation is being created.

Resolves: #79755
Releases: master
Change-Id: I860d87a1b305966a9caa5cbd17bc5bf7229f5704
Reviewed-on: https://review.typo3.org/51644


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Susanne Moog <susanne.moog@typo3.org>
Tested-by: Susanne Moog <susanne.moog@typo3.org>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>