[bbb-greenlight] (39 commits) ...Merge tag 'release-2.7.6'

[Bartłomiej Piotrowski <bpiotrowski src gnome org>]

Summary of changes:

  ff2bfb0... Translate /config/locales/en.yml in es (#2042)
  db20b94... Translate /config/locales/en.yml in gl (#2061)
  a97900b... Translate /config/locales/en.yml in de_DE (#2065)
  e096ba8... Translate /config/locales/en.yml in zh_CN (#2068)
  015b170... Translate /config/locales/en.yml in nl (#2070)
  83cc7ed... Translate /config/locales/en.yml in ja_JP (#2074)
  ca94ac4... Added back ability to set maintenance window through env va
  a278847... fixes #2082 proper link in mail (#2083)
  55dd572... Fixed 404 on room join (#2092)
  a825133... Translate /config/locales/en.yml in fr (#2090)
  7309ef9... Added back join retry as fallback (#2095)
  f992f76... Set default cable adapter to postgres (#2096)
  74ebb15... Fixed 500 when there is an invalid profile picture (#2109)
  3607836... Fixed 500 caused by editting a user when not allowed to (#2
  816cefe... Fixed 404 when resending verification email (#2110)
  75b9892... Added validation for name: Should not include a http(s) url
  5a38ae4... Allow customization of test email recipient (#2107)
  b89cbfa... ENABLE_SSL is now defaulted to true for new installations (
  f8a4f85... Test email configuration during setup (#1144)
  ba7beb8... Switched default cable adapter to postgres (#2139)
  4286864... Puma Worker Configuration (#1701)
  58989c9... Translate /config/locales/en.yml in it (#2131)
  165eecc... Manually encode the ampersand in a presentation file name (
  07557f4... Added env variable to set the default language (#2147)
  c8a104c... Added timestamp to production logs (#2151)
  56be1ad... Improvements to create room modal (#2152)
  1c2e8ad... Removed unused option in code (#2153)
  c80e215... Added a copy access code button (#2161)
  5c79d37... GRN2-xx: Added a tab that displays invited users when using
  92d6c28... Removed public from public room recordings (#2169)
  bc98675... Updated language dropdown to look nicer (#2171)
  da01a3a... Translate /config/locales/en.yml in cs (#2155)
  719989f... Translate /config/locales/en.yml in nl (#2173)
  2e1ca70... Translate /config/locales/en.yml in ja_JP (#2175)
  f841809... Translate '/config/locales/en.yml' in 'de_DE' (#2178)
  57c835d... Translate /config/locales/en.yml in gl (#2180)
  c77ae11... Bumped Rails to 5.2.4.4 (#2185)
  ec4cde6... allow single quote inside email field (#2187)
  0a11499... Merge tag 'release-2.7.6'