This reverts commit 45a4c447.

This reverts commit 2d6fdda1.

Issue #1323120 by webchick, David_Rothstein, kotnik, amateescu: Documentation follow-ups for convert cache system to PSR-0.

Issue #965300 by Gábor Hojtsy, xjm: Change LANGUAGE_NONE to LANGUAGE_NOT_SPECIFIED; add LANGUAGE_NOT_APPLICABLE and LANGUAGE_MULTIPLE.

Issue #1431076 by c960657, nod_, purencool, Nor4a: Fixed Overlay does not work with prefixed URL paths .

Issue #1414412 by pillarsdotnet, MrHaroldA, droplet: Fixed Skip #conjunction key in __clone() method of core/includes/database/query.inc.

Issue #1361218 by Owen Barton: Fixed Focus jumps to tab when pressing enter on a form element within tab.

Issue #1470300 by Gábor Hojtsy, jhodgdon: Added language section to CHANGELOG.txt and a few minor punctuation updates

Issue #1216978 by cosmicdreams, jyve, mortendk, jessebeach, Jacine, aspilicious: Clean up CSS for Contextual module

Issue #1388496 by barraponto: Fixed Default field.tpl.php prints a clearfix class theme_field() doesn't.

Issue #681760 by agentrickard, Josh Waihi, et al: eliminate duplicates caused by node_access() table joins.

- Patch #1222106 by Gábor Hojtsy, plach, xjm: Unify language negotiation APIs, declutter terminology.

- Patch #1272840 by attiks, Gábor Hojtsy, pp, Dave Reid, catch: upgrade path for language domains and validation.