Zabbix

A.F.....S. [ZBXNEXT-3362] added ability to set the default system language

* commit 'd8209a0daf72a1592eb03e3b8074779ac2a81693': (25 commits)
  .......... [ZBXNEXT-3362] code refactoring
  .......... [ZBXNEXT-3362] added new test
  A.F....... [ZBXNEXT-3362] fixed error messages are displayed in English if user session is terminated; improved code style
  ..F....... [ZBXNEXT-3362] made the error icon indicating that some locales are not installed on the web server appear when editing any user except guest
  ........S. [ZBXNEXT-3362] added database upgrade patch to change guest user language and theme to system default
  A.F....... [ZBXNEXT-3362] removed ability to change language and theme for guest user
  ..F....... [ZBXNEXT-3362] fixed LC_MONETARY not being restored
  ..F....... [ZBXNEXT-3362] fixed coding style
  ..F....... [ZBXNEXT-3362] fixed any language can be passed as default_lang
  ..F....... [ZBXNEXT-3362] added missing double quotes
  ..F....... [ZBXNEXT-3362] fixed "You are not logged in" message is always displayed in English when trying to access the installation wizard as a guest if guest mode is disabled
  ..F....... [ZBXNEXT-3362] fixed "Licensed under" is always displayed in English
  ..F....... [ZBXNEXT-3362] fixed the setup language for a logged in user is always English
  ..F....... [ZBXNEXT-3362] fixed undefined offset error
  ........S. [ZBXNEXT-3362] updated ZBX_MAX_FIELDS in dbschema.h to accommodate new config field
  A.F....... [ZBXNEXT-3362] fixed PHP notice being shown in PHP 7.4 after activating disabled guest user
  ..F....... [ZBXNEXT-3362] fixed error messages are displayed in a different language if user session is terminated
  ..F....... [ZBXNEXT-3362] fixed the link to Zabbix Support on the login page does not take into account default system language
  ..F....... [ZBXNEXT-3362] fixed "or sign in as guest" is always displayed in English
  A.F....... [ZBXNEXT-3362] fixed coding style
  ...