Re: [w3c/payment-request] Recommend Payment UI matches doc's language (#944)

I'm nervous about saying this addresses #650 and #952 because it is "merely" a recommendation that the language of the native interface match that of the document's node. I think this could be improved by being slightly more explicit. 

I18N has recommendations (and definitions) in our document [LTLI](https://www.w3.org/TR/ltli/#i18n-terminology), particularly around [here](https://www.w3.org/TR/ltli/#ltli-format-like-doc-language). Perhaps the text would be sufficiently stronger if worded something like this:

> The user interface SHOULD be presented using the language and locale-based formatting that matches the |document|'s [=document element|document element's=] [=Node/language=], if any, or an appropriate fallback locale if that is not available.

Note that I didn't define what "an appropriate fallback locale" would be, leaving that up to the implementation, including allowing the user agent to fall back to its own localization/runtime locale.

I am "okay" with the text as is, but my disquiet is that it can be easily overlooked. 

Thoughts?




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