Issue #2460027 by epari.siva, vijaycs85: Update the documentation of  Drupal\language\LanguageServiceProvider::getDefaultLanguageValues()

Issue #2459971 by Gábor Hojtsy: The langcode key on configuration files is not explicit in configuration schema

Issue #2457271 by rteijeiro, Palashvijay4O, Cottser: More cleanup of the 'themeable' documentation group

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

Issue #2212069 by Gábor Hojtsy, pjonckiere, rteijeiro, cilefen: Non-English Drupal sites get default configuration in English, edited in English, originals not actually used if translated

Revert "Revert "Issue #2457653 by Gábor Hojtsy: System.site langcode is both used as a file language code and a site language code""

This reverts commit 079a52b4.

Revert "Issue #2457653 by Gábor Hojtsy: System.site langcode is both used as a file language code and a site language code"

This reverts commit 364a6e9c.

Issue #2457653 by Gábor Hojtsy: System.site langcode is both used as a file language code and a site language code

Issue #2090115 by alexpott, xjm: Don't install a module when its default configuration has unmet dependencies

Issue #2384863 by Gábor Hojtsy, vijaycs85, rodrigoaguilera: Translation language base field handler should use views field handler, provide unified options

Issue #2017471 by rodrigoaguilera, balagan, clemens.tolboom, Kristen Pol, Outi, rpayanm, danylevskyi, mon_franco, Antti J. Salminen, aloyr, thlafon, Marc Hannaford, kreatIL, oussema, David Hernández: Multilingual tour for language section

Issue #2422685 by balagan: Language negotiation configuration page titles inconsistent, should not even mention "negotiation"

Issue #2350933 by rodrigoaguilera, alexpott, Gábor Hojtsy, YesCT: Languages don't get weights by default, reordered when displayed translated

Issue #2411343 by pcambra: Only allowing to have empty language path prefix for the default language is inappropriate

Issue #2415519 by eojthebrave, nitvirus, jhodgdon: Add @Event documentation to all LanguageConfigOverrideEvents

Issue #2388627 by JeroenT, filijonka, ultimateAnkit, tadityar, rpayanm, adci_contributor: Remove usages of drupal_is_front_page

Issue #2014955 by YesCT, penyaskito, kfritsche, balintcsaba: Deleted bundles do not have their language configuration deleted

Issue #2408439 by zuuperman, askibinski: Language / Translation settings are not saved when adding a new bundle

Issue #2408977 by geertvd: Fatal error: Cannot access protected property Drupal\block\Entity\Block::$id

Issue #2397729 by penyaskito, Gábor Hojtsy, plach, Kristen Pol: Content language settings cannot be configured for non-translatable types on the one page configuration form

Issue #1728804 by Berdir: Introduce (Content)EntityDeleteForm and children to handle entity deletions

Issue #2364157 by mpdonadio, dawehner, martin107, Berdir, pcambra, naveenvalecha, tim.plunkett: Replace most existing _url calls with Url objects

Issue #2405939 by Gábor Hojtsy, olli: use_current_language upcasting option is misleading, it toggles all overrides not just language

Issue #2225427 by ianthomas_uk, martin107, JeroenT, LoMo: Remove remaining uses of deprecated language functions (mostly in object oriented code)