[FEATURE] Add support for Kinyarwanda language

Kinyarwanda is an official language of Rwanda,
which is now supported natively in TYPO3 for any
kind of labels with the ISO-839-1 code "rw".

Resolves: #90115
Releases: master, 9.5
Change-Id: I6958c44de03aa2397e409dc2e3d086bbf2fc46c8
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/62913


Tested-by: Benni Mack <benni@typo3.org>
Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Daniel Goerz <daniel.goerz@posteo.de>
Reviewed-by: Benni Mack <benni@typo3.org>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Reviewed-by: Daniel Goerz <daniel.goerz@posteo.de>