Tests

Enable theme translation #482

Job	Run time
Build CPython docs (3.14)	2m 54s
translations (windows-latest, 3)	27s
translations (ubuntu-latest, 3)	14s
translations (ubuntu-latest, 3.12)	12s
translations (windows-latest, 3.12)	32s
Build CPython docs (3.13)	3m 2s
Build CPython docs (3.12)	2m 57s
	10m 18s

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