[TASK] Change the label for scheduler "Save and create"

The label for the "Save and create new document" in the scheduler module,
will be change to a more appropriate label "Save and create new task"

Resolves: #83920
Releases: master, 8.7, 7.6
Change-Id: Ic4d6ad9d4598aafbc16c03b5bc50789451f6cdaf
Reviewed-on: https://review.typo3.org/55807


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>