[BUGFIX] Add missing language file for ContextMenu

Confirmation Modal shows buttons with translated button labels now, if
you try to delete a page from page-tree.

Resolves: #79879
Releases: master, 8.7
Change-Id: Iff2ed8205bdcc54b48ba301035cd0aac9c2de826
Reviewed-on: https://review.typo3.org/58186


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Guido Schmechel <guido.schmechel@brandung.de>
Tested-by: Guido Schmechel <guido.schmechel@brandung.de>
Reviewed-by: Jörg Bösche <typo3@joergboesche.de>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>