[openstreetmap-website] add details in description meta tag; and add og:description and twitter:description (#1066)

[Mikel Maron]

Yea, and there's no way to add alternate languages to og. So keep it simple, and set description to printable_name, and force to use the English text and the default "name" tag 

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https://github.com/openstreetmap/openstreetmap-website/issues/1066#issuecomment-145998901
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