Using the 'Copy To Account' (which uses the same tech as SDF) feature to move a custom transaction to production and I get the attached error message. I have checked both the custom transaction and the referenced custom record which is

customrecord_2663_approval_routing

but I cannot find any translations. Does anyone have an idea anywhere else I can look?

the translations will be part of the same bundle as that 2663 custom record but you can't migrate them ... they could also be nested in dependencies of that bundle... regardless they'll be locked and you won't be able to extract them and deploy them yourself, and you can't reference them directly either so you're just stuck unfortunately... at least to the best of my knowledge, let me know if you figure something out

The 25.2 release notes say that this will be fixed. They actually call it an enhancement instead of a 4 year old bug fix. I don't care what they call it as long as it's fixed. 🙂

I can usually get past these translation dependency problems by using SDF to import from one environment and deploy to another, but I do have to fix up or remove all the invalid references first so sometimes it's just as much work or more, than manually re-creating the project in the target environment. It just depends.