Issue #2070369 by herom, bdgreen, Mac_Weber, InternetDevels, sidharthap, JeroenT: Remove all calls to deprecated function language().

Issue #2002134 by fago, yched, amateescu, effulgentsia: Move TypedData metadata introspection from data objects to definition objects.

Issue #1996238 by sun, nod_, damiankloip, Wim Leers, longwave, alexpott, Xano, mdrummond, Mark Carver, Jeff Burnz, highrockmedia, joelpittet, et al: Replace hook_library_info() by *.libraries.yml file.

Issue #1981858 by Berdir, tim.plunkett, longwave, Les Lim: Rename hook_entity_info/alter() to hook_entity_type_build/alter().

Issue #2165155 by Berdir, tim.plunkett: Change $entity_type to $entity_type_id and $entity_info to $entity_type/$entity_types.

Issue #2184707 by pwolanin, Berdir: Misnamed variable in content_translation_menu_link_defaults_alter().

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

Issue #2047633 by pwolanin, dawehner, kim.pepper, Xano, amateescu, tim.plunkett: Move definition of menu links to hook_menu_link_defaults(), decouple key name from path, and make 'parent' explicit.

Revert "Issue #2047633 by dawehner, pwolanin, Xano, amateescu, tim.plunkett: Move definition of menu links to hook_menu_link_defaults(), decouple key name from path, and make 'parent' explicit."

This reverts commit 531fd593.

Issue #1831608 by smiletrl, penyaskito, swentel, jlbellido, vijaycs85, Gábor Hojtsy, piyuesh23, sun, YesCT | Lukas von Blarer: Show or hide the 'Make field translatable' checkbox on the add field form depending on translatability.

Issue #2047633 by dawehner, pwolanin, Xano, amateescu, tim.plunkett: Move definition of menu links to hook_menu_link_defaults(), decouple key name from path, and make 'parent' explicit.

Issue #2168333 by tim.plunkett, EclipseGc, yched, fago: Ensure custom EntityType controllers can be provided by modules.

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 #1968970 by plach: Standardize module-provided entity info documentation and clean-up the @EntityType annotation.

Issue #2078057 by m1r1k, joelpittet, areke: Remove references to global  in Content Translation module.

Issue #2005716 by tim.plunkett, msonnabaum, dawehner, alexpott, effulgentsia: Promote EntityType to a domain object.

Issue #2107531 by pwolanin, neclimdul, cilefen, dawehner, YesCT, tim.plunkett: Improve DX of local task YAML definitions.

Issue #1954892 by dawehner, David_Rothstein, tim.plunkett: Replace 'theme callback' and hook_custom_theme() with a clean theme negotiation system.

Issue #2081149 by areke, deneo, mrsinguyen: Remove Unused local variable  from /core/modules/content_translation/content_translation.module.

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 #2047229 by fago, smiletrl, Berdir, effulgentsia, amateescu: Make use of classes for entity field and data definitions.

Issue #2021161 by dawehner, Xano, AjitS, tim.plunkett: Replace the fallback node listing with a list controller.

Revert "Issue #1954892 by dawehner, tim.plunkett, David_Rothstein, effulgentsia: Replace 'theme callback' and hook_custom_theme() with a clean theme negotiation system."

This reverts commit fc04601c.

Issue #1954892 by dawehner, tim.plunkett, David_Rothstein, effulgentsia: Replace 'theme callback' and hook_custom_theme() with a clean theme negotiation system.

Issue #2133469 by tim.plunkett, damiankloip, dawehner: Replace path-based entity links with route names.

Issue #1810350 by plach, kfritsche, boran, YesCT: Remove menu_* entity keys and replace them with entity links.

Issue #2084463 by dawehner, pwolanin, David_Rothstein, tim.plunkett, Xano: Convert contextual links to a plugin system similar to local tasks/actions.

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 #2102125 by dawehner, tim.plunkett, neclimdul, pwolanin, YesCT, damiankloip, Tim Bozeman: Big Local Task Conversion.

Issue #2004878 by kalabro, DmitryDrozdik, YesCT: Config page title 'Content language settings' misleading after translation is enabled.

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