[w3c/browser-payment-api] Missing (normative) reference to BPC-47 (language code) (#503)

The definition of the languageCode attribute says: "This is the BCP-47 language code for the address."

BCP-47 is not defined in the spec and should probably be a normative reference. 
 https://tools.ietf.org/html/bcp47

Ian

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