[TASK] Add aria-label atributes to topbar icons

To announce the buttons correctly when using assistive technologies
there needs to be an aria-label, as there will not be a real label
attached to the top bar buttons.

Resolves: #92667
Releases: master
Change-Id: I5cd6eae2da613ba87205835da4d1926b3076c6f0
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/66320


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Benni Mack <benni@typo3.org>
Tested-by: Michael Telgkamp <michael.telgkamp@mindscreen.de>
Tested-by: Oliver Bartsch <bo@cedev.de>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Benni Mack <benni@typo3.org>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Michael Telgkamp <michael.telgkamp@mindscreen.de>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>