The closed captions for the following sound events are missing:
entity.baby_horse.ambiententity.baby_horse.hurtentity.baby_horse.deathentity.baby_horse.angryentity.baby_horse.eatentity.baby_horse.fallentity.baby_horse.landentity.baby_horse.stepentity.baby_horse.breathe
I re-tested this in 26.1-snapshot-5, where the issue is marked as fixed.
While most baby horse captions now appear to be translated, entity.baby_horse.land still shows as untranslated in closed captions.
This suggests the fix may have been incomplete, with at least one caption key still missing.