7 files declare their use of ContentTranslationUITestBase in Zircon Profile 8

BlockContentTranslationUITest.php in core/modules/block_content/src/Tests/BlockContentTranslationUITest.php

Contains \Drupal\block_content\Tests\BlockContentTranslationUITest.

CommentTranslationUITest.php in core/modules/comment/src/Tests/CommentTranslationUITest.php

Contains \Drupal\comment\Tests\CommentTranslationUITest.

MenuLinkContentTranslationUITest.php in core/modules/menu_link_content/src/Tests/MenuLinkContentTranslationUITest.php

Contains \Drupal\menu_link_content\Tests\MenuLinkContentTranslationUITest.

NodeTranslationUITest.php in core/modules/node/src/Tests/NodeTranslationUITest.php

Contains \Drupal\node\Tests\NodeTranslationUITest.

ShortcutTranslationUITest.php in core/modules/shortcut/src/Tests/ShortcutTranslationUITest.php

Contains \Drupal\shortcut\Tests\ShortcutTranslationUITest.

TermTranslationUITest.php in core/modules/taxonomy/src/Tests/TermTranslationUITest.php

Contains \Drupal\taxonomy\Tests\TermTranslationUITest.

UserTranslationUITest.php in core/modules/user/src/Tests/UserTranslationUITest.php

Contains \Drupal\user\Tests\UserTranslationUITest.