Tests

Enable theme translation #490

Job	Run time
Build CPython docs (3.14)	2m 53s
Build CPython docs (3.13)	3m 8s
translations (ubuntu-latest, 3.12)	10s
translations (ubuntu-latest, 3)	16s
translations (windows-latest, 3)	23s
Build CPython docs (3.12)	2m 55s
translations (windows-latest, 3.12)	30s
	10m 15s

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