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c937a9e85f
Some of our interface locales include uppercase country codes, which are separated by `_` instead of the more common `-`. Also, a browser's `Accept-Language` header could be in lowercase. This commit attempts to normalize those cases so a browser's language+country codes can better match with our locales. This solution assumes that our UI locales have nothing more than language and optionally country. If we ever add a script specific locale like `zh-Hant-TW` this would have to change to accomodate that, but the idea would be pretty much the same as this fix.