[TASK] Use explicit button labels in backend user module

The backend user module contains of different
sub modules. All those sub modules contain a
"create new record" button in the doc header.
This button does now contain the actual record
to be created, instead of a general label.

Additionally does this patch add the missing
"resname" attribute to newly added locallang
labels and cleans up LocalizationUtility::translate()
usages in the BackendUserController.

Resolves: #99707
Related: #99038
Releases: main
Change-Id: I6eef95ab6dcf083faf1f0a0659c82c3a49bf485b
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/77594


Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Tested-by: Oliver Bartsch <bo@cedev.de>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Annett Jähnichen <mcmietz@web.de>
Reviewed-by: Annett Jähnichen <mcmietz@web.de>
Reviewed-by: Oliver Bartsch <bo@cedev.de>