[heycam/webidl] Exception message does not supply language or direction metadata (#1023)

https://www.w3.org/TR/WebIDL/#dfn-DOMException

>  Exceptions have an error name, a DOMString, which is the type of error the exception represents, and a message, which is an optional, user agent-defined value that provides human readable details of the error. 

The `message` attribute of DOMException does not include language or base direction metadata (see https://w3c.github.io/string-meta). Lack of this metadata can mean that the exception message is not properly rendered. While messages in DOMExceptions are often intended for developer debugging purposes, this is not always true--and developers are people (who speak a language) too.

[I18N-ACTION-1051]

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