[heycam/webidl] Provide i18n guidance on localization of DOMException's .message (#996)

An issue about how browser's should localize `DOMException`'s `.message` attribute came up as part of the Geolocation API:
https://github.com/w3c/geolocation-api/issues/50

In Geolocation, we have a `GeolocationPositionError`, which is similar to a `DOMException`. 

Anyway, it would be good to provide some general guidance, as `DOMException` is the largest source of developer-facing error messages in the platform (and then we can point to that for `GeolocationPositionError`). 


-- 
You are receiving this because you are subscribed to this thread.
Reply to this email directly or view it on GitHub:
https://github.com/heycam/webidl/issues/996