Twenty Fourteen: implement UX features in spite of being non-standard CSS selectors that won't validate. `@viewport` for a better touch experience on Windows, and `::selection` for better text selection styles. See #25888 and #25898, props celloexpressions.
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Bundled Themes: implement Microsoft-specific `@viewport` rules for better responsive styling in Windows 8 "snapped" views. Props celloexpressions, fixes #25888.
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Twenty Fourteen: allow slider "Previous" and "Next" labels to be translated, props michahwave. Fixes #25897.
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