constant LANGUAGE_SYSTEM

System language (only applicable to UI).

Refers to the language used in Backdrop and module/theme source code.

6 uses of LANGUAGE_SYSTEM

format_date in core/includes/common.inc: Formats a date, using a date type or a custom date format string.
LocaleTranslationFunctionalTest::testStringSearch in core/modules/locale/tests/locale.test: Tests translation search form.
LocaleTranslationFunctionalTest::testStringTranslation in core/modules/locale/tests/locale.test: Adds a language and tests string translation by users with the appropriate permissions.
locale_translation_filters in core/modules/locale/locale.pages.inc: List locale translation filters that can be applied.
t in core/includes/bootstrap.inc: Translates a string to the current language or to a given language.

core/includes/bootstrap.inc, line 191: Functions that need to be loaded on every Backdrop request.

define('LANGUAGE_SYSTEM', 'system')