[BUGFIX] Change deprecation of language:update command

Keep the nice and concise name instead of the long and clumsy name.
Also set an alias instead of registering the command twice.

Releases: master
Resolves: #82315
Change-Id: I302977702e2d09f1377f078af2f8b60f515cce1e
Reviewed-on: https://review.typo3.org/55205


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Stefan Neufeind <typo3.neufeind@speedpartner.de>
Reviewed-by: Benni Mack <benni@typo3.org>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Benni Mack <benni@typo3.org>