Issue #2871357 by alexpott, kriboogh: Installer tasks using multiple batch sets in non-interactive mode do not get executed

Issue #3072702 by alexpott, Wim Leers, mikelutz, xjm, catch, Berdir, tedbow, webchick, shaal, Mixologic, heddn: Core extensions should not need to specify the new core_version_requirement in *.info.yml files so that 9.0.x can be installed

Issue #2468767 by eiriksm, Gábor Hojtsy: English config source strings are saved as custom translations in locale in foreign install

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

Issue #2070737 by herom, EllaTheHarpy, alexpott: Change values of LanguageInterface::DIRECTION_(LTR/RTL) to ('ltr'/'rtl').

Issue #2336743 by webflo, penyaskito, YesCT, Gábor Hojtsy: Fixed When more than one language is added in the profile, the installer ignores those.