Issue #2389455 by hussainweb, AjitS, Mile23, subhojit777, tibbsa, Ayesh: Clean-up system module test members - ensure property definition and use of camelCase naming convention

Issue #2457887 by prateekMehta, stefan.r, rpayanm, alexpott: Use Utility\SafeMarkup class instead of Utility\String for placeholder(), checkPlain(),format() functions

Issue #2358079 by pwolanin, Berdir: Require a specific placeholder format in db_query() in order to trigger argument expansion, and require explicit 'IN' parameter for conditions

Issue #2143729 by tstoeckler, plach, jsbalsera, Berdir, mauzeh, damiankloip, andypost: Entity definitions miss a language entity key

Issue #2340667 by YesCT, Pedro Lozano, alexpott, martin107: Protect Drupal\Core\Language\Language::id, and use getId().

Issue #2346911 by larowlan, vijaycs85, Berdir | sihv: Fixed Base field overrides have incorrect default value callable properties.

Issue #2312093 by alexpott, yched, andypost, swentel | xjm: Rename FieldInstanceConfig to FieldConfig.

Issue #2336177 by alexpott, YesCT: Fixed ConfigurableLanguage cannot be created/removed directly, integrate language_save() and language_delete().

Issue #1966436 by naveenvalecha, cesarmiquel, Berdir, mr.york, jlbellido, segi, vasi1186, Leksat, Gábor Hojtsy, Schnitzel, grisendo, Aron Novak, likin, penyaskito, vijaycs85, kfritsche, fago: Fixed Default *content* entity languages are not set for entities created with the API.

Issue #697760 by sun: Replace getInfo() in tests with native phpDoc + annotations (following PHPUnit).

Issue #2246665 by jaredsmith, martin107, YesCT, filijonka, tstoeckler: Typehint with Drupal\Core\Language\LanguageInterface instead Drupal\Core\Language\Language.

Issue #2099131 by jessebeach, Wim Leers, catch, Berdir, benjifisher, martin107, andypost: Use #pre_render pattern for entity render caching.

Issue #2166915 by ianthomas_uk, sun | plach: Remove uses of deprecated language functions in tests and procedural code.

Issue #2223361 by Berdir, fago, tim.plunkett: Rename ComplexDataInterface::getPropertyValues() to toArray(), remove setPropertyValues().

Issue #2114707 by Berdir, yched, amateescu, effulgentsia, fago: Allow per-bundle overrides of field definitions.

Issue #2095303 by swentel, plopesc, Berdir, claudiu.cristea, yched: Rename 'field_entity' to 'field_config' and 'field_instance' to 'field_instance_config'.

Issue #2164827 by Berdir, Xano, tim.plunkett: Rename the entityInfo() and entityType() methods on EntityInterface and EntityStorageControllerInterface.

Issue #1862202 by plach, Berdir, katbailey, ParisLiakos, alexpott, chx, sun, larowlan, Gábor Hojtsy, cosmicdreams, vijaycs85, YesCT, penyaskito, andypost, Albert Volkman, joelpitett: Objectify the language system.

Issue #2062247 by m1r1k, Garbar: Remove calls to deprecated global  in core/modules/system/lib/Drupal/system/Tests/Entity/EntityTranslationTest.php.

Issue #2076445 by plach, andypost, yched, Gábor Hojtsy: Make sure language codes for original field values always match entity language regardless of field translatability.

Issue #2129039 by plach, jthorson, pfrenssen, nyirocsaba, Gábor Hojtsy: Integrity constraint violation when translating body field.

Revert "Issue #2129039 by plach, jthorson, pfrenssen, nyirocsaba, Gábor Hojtsy: Integrity constraint violation when translating body field."

Testbot does not like this patch. Needs further investigation.

This reverts commit b0ed7570.

Issue #2129039 by plach, jthorson, pfrenssen, nyirocsaba, Gábor Hojtsy: Integrity constraint violation when translating body field.

Issue #2019055 by plach, fago, berdir, yched, Gábor Hojtsy, kfritsche, jibran: Switch from field-level language fallback to entity-level language fallback.

Revert "Issue #2019055 by plach, fago, kfritsche: Switch from field-level language fallback to entity-level language fallback."

This reverts commit 46942cd3.

Issue #2019055 by plach, fago, kfritsche: Switch from field-level language fallback to entity-level language fallback.

Issue #2004626 by plach, kfritsche, vijaycs85, Pancho, penyaskito: Make non-configurable field translation settings available in the content language settings.

Issue #2057401 by plach, socketwench, kfritsche, Damien Tournoud: Fixed Make the node entity database schema sensible.

Revert "Issue #2057401 by plach, socketwench, kfritsche: Fixed Make the node entity database schema sensible."

HEAD broken; rolling back temporarily.

This reverts commit c72f39ad.