[BUGFIX] Add language key for "SiteTemplate" in TypoScript submodule

The "Included TypoScript" submodule shows the type of tree child as
a badge.
This patch adds a missing corresponding language key for the newly
introdued site sets.

Resolves: #103992
Related: #103437
Releases: main
Change-Id: Ia7ef1b7b49f9ca1a6c1859c37a62f0101265f2f1
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/84517


Tested-by: Stefan Bürk <stefan@buerk.tech>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Garvin Hicking <gh@faktor-e.de>
Reviewed-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: Garvin Hicking <gh@faktor-e.de>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: core-ci <typo3@b13.com>