Issue #2375879 by jibran, dawehner: Don't filter languages in case it is not needed
Issue #2343181 by herom, vermario, rpayanm: RTL issues on front page
Issue #2358993 by rpayanm, JeroenT: Remove usage of drupal_mail_system()
Issue #2376899 by Gábor Hojtsy: ImageFieldTestBase::createImageField() takes a description in field settings errorneously
Issue #2378329 by almaudoh: Update AccountProxyInterface::setAccount() documentation to point people to the account_switcher service
Issue #2374201 by YesCT: Docs and quote coding standard follow-up from: Incorrect logic in creating url to fetch information about project updates