I would love it if MP3Tag had the ability to translate tags from language to language, for example, Japanese into English or vice versa, Chinese to Spanish, etc.
I don't know if there is any way to do that now. But, it would be helpful sometimes.
You could use the export function and then use the exported data in a dedicated (and probably much more powerful) translating program.
If you take care that the filename is included in the exported data, then it should be possible to re-import the translated strings.