[heycam/webidl] Exceptions not localizable (#1024)

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 provide a localization mechanism (a means of providing multiple language variations of the message or a means of negotiating the language). This has come up in a few recent spec reviews at W3C.

[I18N-ACTION-1051]

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