[BUGFIX] Do not show language switch in edit multiple

FormEngine allows to edit multiple records at once.
This view can e.g. be accessed using the recordlists'
"Edit marked" button.

Since the "language switcher" only affects the first
displayed record, it is now not longer rendered, when
in "edit multiple" view.

To improve readability of the code, all those places
now use the same "speaking" method.

Resolves: #94900
Releases: master
Change-Id: Iae0ccd69616324fed915dbc0bb781c4edc95971b
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/70618


Tested-by: core-ci <typo3@b13.com>
Tested-by: Jochen <rothjochen@gmail.com>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Jochen <rothjochen@gmail.com>
Reviewed-by: Benni Mack <benni@typo3.org>