As there are some activities happening in strengthening the setup Domain feature (Services, Manufacturing, Healthcare etc.), it would be nice to add the ability to label DocTypes as demanded by the domain.
For example, for the Healthcare domain it would make sense to label the Customer as a Patient. Print headings would help in case of documents, but for masters labelling will be needed. Custom translations looks to me as an easy hack, but I guess translations are there for a different purpose.