Issue #1833022 by e0ipso, plach, YesCT, kfritsche, penyaskito, vijaycs85, nod_, cam8001: Only display interface language detection options to customize more granularity.

Issue #1754246 by webflo, swentel, penyaskito, andypost, alexpott, YesCT, dagmar: Languages should be configuration entities.

Issue #1620010 by dawehner, ParisLiakos, plach, jibran: Move LANGUAGE constants to the Language class.

Passing the request object explicitly to the language negotiation methods instead of a vague args parameter

Using the language_manager wrapper function to return a language whether or not we're in the requet scope

- Patch #1497230 by Rob Loach, pdrake, effulgentsia: Use Dependency Injection to handle object definitions.

- Patch  #1468930 by dawehner, Gábor Hojtsy, plach, das-peter, fubhy: clean up and move the code for the negotiation functionality from locale module to language module.

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

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

- Patch #1416392 by Gábor Hojtsy, plach, rvilar: clean up language (types) bootstrap function naming and documentation.

- Patch #1314384 by Pol, Gábor Hojtsy, plach: remember the provider that selected the language for later use.

Issue #334024 by klausi, catch, beejeebus, sun: Use const keyword to define constants instead of define().

Issue #1301460 by loganfsmyth, good_man, Gábor Hojtsy, xjm: Decouple domain/path language negotiation storage from language config storage.

Nate Lampton authored Oct 30, 2011 and catch committed Nov 01, 2011

Issue #22336 by quicksketch, scor, boombatower, and rfay. Move all core Drupal files under a core subdirectory.

- Patch #1280550 by loganfsmyth: language negotiation UX: Change wording and add link on 'detection and selection' page.

#587706 follow-up by plach: trim GET['q'] centrally in request_path() so subsequent places don't have to do it.

#282191 follow-up by plach: Remove ambitious parts of translatable fields UI from core that are no longer relevant, given what made it into Drupal 7.

#587706 by dalin: Fixed language_initialize() needs to clean up ['q'] just like drupal_path_initialize() does.

#678546 by rfay and jhodgdon: Improve wording of help text in admin/config/regional/language/configure.

#320331 by Dave Reid, dww, John Morahan, cwgordon7, moshe weitzman, c960657, and smoothify: Turn custom_url_rewrite_inbound() and custom_url_rewrite_outbound() into hooks.

#565480 by plach and peximo: TF #2: Multilingual field handling. Integration between field API and locale module + translatable node bodies.

- Patch #262920 by ainigma32: language selection for domain should look at HTTP_HOST not SERVER_NAME.

- Patch #245115 by kkaefer, John Morahan, JohnAlbin et al: after a long discussion we've decided to make the concatenation operator consistent with the other operators.