[BUGFIX] Fix two typos in one install tool language label

Releases: 6.2, 6.1
Resolves: #49345
Change-Id: I05b62e01e0115e854eb6202a4198ac7ec888f843
Reviewed-on: https://review.typo3.org/21597
Reviewed-by: Anja Leichsenring
Tested-by: Anja Leichsenring