Long shot: Any #Rails devs know of a method to add a `lang` attribute on any text that's missing a translation, so has had to fall back to the default locale? I suspect I might need to write my own i18n backend, but I'd love to find something already out there.
Boosts for reach appreciated!
If I *do* end up writing my own version of the I18n::Fallback backend, I'll try to get it merged upstream into Rails core; accessibility by default is best accessibility.