8 string references to 'language_default'

drupal-7.language.database.php in drupal/core/modules/system/tests/upgrade/drupal-7.language.database.php
Database additions for language tests. Used in upgrade.language.test.
LanguageDependencyInjectionTest::testDependencyInjectedNewDefaultLanguage in drupal/core/modules/language/lib/Drupal/language/Tests/LanguageDependencyInjectionTest.php
Test dependency injected Language object against a new default language object.
LanguageManager::getLanguageDefault in drupal/core/lib/Drupal/Core/Language/LanguageManager.php
Returns a language object representing the site's default language.
LanguageUILanguageNegotiationTest::testUILanguageNegotiation in drupal/core/modules/language/lib/Drupal/language/Tests/LanguageUILanguageNegotiationTest.php
Tests for language switching by URL path.
language_save in drupal/core/modules/language/language.module
API function to add or update a language.
language_uninstall in drupal/core/modules/language/language.install
Implements hook_uninstall().
update_prepare_d8_bootstrap in drupal/core/includes/update.inc
Performs extra steps required to bootstrap when using a Drupal 7 database.
update_prepare_d8_language in drupal/core/includes/update.inc
Prepares Drupal 8 language changes for the bootstrap if needed.