[w3c/payment-request] Add localization hint for payment sheet (#656)

* Adds "lang" member to PaymentRequestInit dictionary
* Adds processing model for `lang`
* Optionally allows UA to localize the payment sheet

closes #650
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/payment-request/pull/656

-- Commit Summary --

  * Add localization hint for payment sheet

-- File Changes --

    M index.html (45)

-- Patch Links --

https://github.com/w3c/payment-request/pull/656.patch
https://github.com/w3c/payment-request/pull/656.diff

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