At some point the support for *_DBL strings, used in large/huge/double size font, has been removed. Don't know whether this was deliberate, but we'll either have to put it back in (if this is still a supported feature) or can remove the remaining *_DBL strings.

I'd guess that feature is gone. There are only about 15 strings using it at all. Probably not worth adding the overhead for those few cases to the display code.