7 uses of LANGUAGE_CONFIGURABLE

AccountFormController::form in drupal/core/modules/user/lib/Drupal/user/AccountFormController.php
Overrides Drupal\Core\Entity\EntityFormController::form().
EntityTranslationController::entityFormAlter in drupal/core/modules/translation_entity/lib/Drupal/translation_entity/EntityTranslationController.php
Implements EntityTranslationControllerInterface::entityFormAlter().
form_test_language_select in drupal/core/modules/system/tests/modules/form_test/form_test.module
Builds a form to test the language select form element.
LanguageSelectElementTest::testLanguageSelectElementOptions in drupal/core/modules/system/lib/Drupal/system/Tests/Form/LanguageSelectElementTest.php
Tests that the options printed by the language select element are correct.
language_element_info_alter in drupal/core/modules/language/language.module
Implements hook_element_info_alter().
language_list in drupal/core/includes/bootstrap.inc
Returns a list of languages set up on the site.
language_negotiation_configure_selected_form in drupal/core/modules/language/language.admin.inc
Builds the selected language negotiation method configuration form.