[!!!][TASK] Remove the explicitConfirmationOfTranslation setting

This feature is unused, and the used buttons are being removed
in the "unsplit the split button" concept. This change removes
the buttons and installation tool setting.

Resolves: #84810
Releases: master
Change-Id: I0fa1f57df7e276b2d44f47c708cee78f08a43d81
Reviewed-on: https://review.typo3.org/56754


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Mathias Schreiber <mathias.schreiber@typo3.com>
Tested-by: Mathias Schreiber <mathias.schreiber@typo3.com>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>