CI tests

Adjust ldf languages to accord with the guidance in the Babel docs. #6459

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Run time

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Job	Run time
linux (8.10, latest, -Werror)	21m 7s
windows	10m 26s
linux-stack	9m 14s
linux (9.0, latest, -Werror)	21m 7s
linux (9.2, latest, -Werror)	16m 9s
linux (9.4, latest, -Werror)	12m 40s
linux (9.6, latest, -Werror)	12m 25s
linux (9.8, latest, -Werror)	8m 50s
linux (9.10, latest)	7m 42s
	1h 59m 40s