6 files declare their use of ContentLanguageSettingsForm

ContentTranslationDisableSettingTest.php in core/modules/content_translation/tests/src/Functional/ContentTranslationDisableSettingTest.php
ContentTranslationEnableTest.php in core/modules/content_translation/tests/src/Functional/ContentTranslationEnableTest.php
ContentTranslationSettingsTest.php in core/modules/content_translation/tests/src/Functional/ContentTranslationSettingsTest.php
ContentTranslationUISkipTest.php in core/modules/content_translation/tests/src/Functional/ContentTranslationUISkipTest.php
EntityTypeWithoutLanguageFormTest.php in core/modules/language/tests/src/Functional/EntityTypeWithoutLanguageFormTest.php
LanguageSelectorTranslatableTest.php in core/modules/language/tests/src/Functional/LanguageSelectorTranslatableTest.php

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