use XHTML/HTML5 values for &lang; and &rang;
use XHTML/HTML5 values for &lang; and &rang;

Summary:HTML5 and XHTML use different values for &lang; and &rang; than HTML4 did.

Discrepancy noticed by ariya in https://github.com/jquery/esprima/pull/1470.

References:
 - https://dev.w3.org/html5/html-author/charref
 - https://www.w3.org/TR/html4/sgml/entities.html
 - https://www.w3.org/TR/xml-entity-names/xhtml1-symbol.html
 - https://bugs.webkit.org/show_bug.cgi?format=multiple&id=11448 (very similar WebKit bug)

Reviewed By: samwgoldman

Differential Revision: D2945766

fb-gh-sync-id: 06b974194c95c7c47a06a82a4e3a62c06064c5f2
shipit-source-id: 06b974194c95c7c47a06a82a4e3a62c06064c5f2

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