[BUGFIX] Add meaningful title for main menu group "Site Management"

This patch adds a meaningful title attribute text when
hovering on the backend main menu group "sites".

It also adds helpful context for the transation UI where
necessary.

Resolves: #99913
Releases: main
Change-Id: I1b46bf5b1ab0b75411e982b3de3c60d2d4496d61
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/77817


Tested-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Tested-by: Guido Schmechel <guido.schmechel@brandung.de>
Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Guido Schmechel <guido.schmechel@brandung.de>