[BUGFIX] Add reference count to delete message

If you delete a file or folder by using the clickmenu, a confirmation
message without reference count is shown. To streamline the confirmation
message with the one from FileList, the reference count is added with
this patch.

Resolves: #75156
Releases: master, 7.6, 6.2
Change-Id: I84fe8c853199cdb4e0ff422cdb5fc327e4bdc683
Reviewed-on: https://review.typo3.org/47329


Reviewed-by: Nicole Cordes <typo3@cordes.co>
Tested-by: Nicole Cordes <typo3@cordes.co>
Reviewed-by: Daniel Goerz <ervaude@gmail.com>
Tested-by: Daniel Goerz <ervaude@gmail.com>
Reviewed-by: Andreas Fernandez <typo3@scripting-base.de>
Tested-by: Andreas Fernandez <typo3@scripting-base.de>