[BUGFIX] Make translation of form validation errors consistent

The labels have been made consistent with a native speaker.

Resolves: #84804
Releases: master

Change-Id: Iec8e6aed75314d91abf0669614a5aa57260e7204
Reviewed-on: https://review.typo3.org/56746


Reviewed-by: Björn Jacob <bjoern.jacob@tritum.de>
Tested-by: Björn Jacob <bjoern.jacob@tritum.de>
Reviewed-by: Ralf Zimmermann <ralf.zimmermann@tritum.de>
Tested-by: Ralf Zimmermann <ralf.zimmermann@tritum.de>
Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Frank Naegler <frank.naegler@typo3.org>
Tested-by: Frank Naegler <frank.naegler@typo3.org>