For this to work, we'll have to implement i10n in the code that generates the spec, e.g. jsonBodyValidator::getOpenAPISpec().
Compare the discusstion at https://github.com/OAI/OpenAPI-Specification/issues/274
Also, we'll want to think about how exactly to do that. Do we just change the descriptions, or do we add different keys, like this library does? https://www.npmjs.com/package/swagger-i18n-extensio