15 files declare their use of LanguageManager
- ActiveLinkResponseFilterTest.php in core/tests/ Drupal/ Tests/ Core/ EventSubscriber/ ActiveLinkResponseFilterTest.php 
- CKEditor5Test.php in core/modules/ ckeditor5/ tests/ src/ FunctionalJavascript/ CKEditor5Test.php 
- ConfigEntityValidationTestBase.php in core/tests/ Drupal/ KernelTests/ Core/ Config/ ConfigEntityValidationTestBase.php 
- ConfigurableLanguage.php in core/modules/ language/ src/ Entity/ ConfigurableLanguage.php 
- ConfigurableLanguageManager.php in core/modules/ language/ src/ ConfigurableLanguageManager.php 
- DateTest.php in core/tests/ Drupal/ Tests/ Core/ Datetime/ DateTest.php 
- DrupalDateTimeTest.php in core/tests/ Drupal/ Tests/ Core/ Datetime/ DrupalDateTimeTest.php 
- EntityCreateAccessCustomCidTest.php in core/tests/ Drupal/ Tests/ Core/ Entity/ Access/ EntityCreateAccessCustomCidTest.php 
- install.core.inc in core/includes/ install.core.inc 
- API functions for installing Drupal.
- InstallerLanguagePageTest.php in core/tests/ Drupal/ FunctionalTests/ Installer/ InstallerLanguagePageTest.php 
- Language.php in core/modules/ ckeditor5/ src/ Plugin/ CKEditor5Plugin/ Language.php 
- LanguageAddForm.php in core/modules/ language/ src/ Form/ LanguageAddForm.php 
- LanguagePluginTest.php in core/modules/ ckeditor5/ tests/ src/ Unit/ LanguagePluginTest.php 
- SelectLanguageForm.php in core/lib/ Drupal/ Core/ Installer/ Form/ SelectLanguageForm.php 
- UserLangcode.php in core/modules/ user/ src/ Plugin/ migrate/ process/ UserLangcode.php 
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