[TASK] Remove reference to not existing labels

As the labels don't exist, the usage can be dropped.

Resolves: #83388
Releases: master, 8.7
Change-Id: I43442a847f0705decbddf09139cfdb243ee0d099
Reviewed-on: https://review.typo3.org/55185


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

typo3/sysext/core/Configuration/TCA/pages.php

@@ -1063,23 +1063,18 @@ return [
             'showitem' => 'doktype;LLL:EXT:frontend/Resources/Private/Language/locallang_tca.xlf:pages.doktype_formlabel',
         ],
         'shortcut' => [
-            'label' => 'LLL:EXT:frontend/Resources/Private/Language/locallang_tca.xlf:pages.palettes.shortcut',
             'showitem' => 'shortcut_mode;LLL:EXT:frontend/Resources/Private/Language/locallang_tca.xlf:pages.shortcut_mode_formlabel',
         ],
         'shortcutpage' => [
-            'label' => 'LLL:EXT:frontend/Resources/Private/Language/locallang_tca.xlf:pages.palettes.shortcutpage',
             'showitem' => 'shortcut;LLL:EXT:frontend/Resources/Private/Language/locallang_tca.xlf:pages.shortcut_formlabel',
         ],
         'mountpoint' => [
-            'label' => 'LLL:EXT:frontend/Resources/Private/Language/locallang_tca.xlf:pages.palettes.mountpoint',
             'showitem' => 'mount_pid_ol;LLL:EXT:frontend/Resources/Private/Language/locallang_tca.xlf:pages.mount_pid_ol_formlabel',
         ],
         'mountpage' => [
-            'label' => 'LLL:EXT:frontend/Resources/Private/Language/locallang_tca.xlf:pages.palettes.mountpage',
             'showitem' => 'mount_pid;LLL:EXT:frontend/Resources/Private/Language/locallang_tca.xlf:pages.mount_pid_formlabel',
         ],
         'external' => [
-            'label' => 'LLL:EXT:frontend/Resources/Private/Language/locallang_tca.xlf:pages.palettes.external',
             'showitem' => 'url;LLL:EXT:frontend/Resources/Private/Language/locallang_tca.xlf:pages.url_formlabel',
         ],
         'title' => [