Language switcher block is an unlabelled navigation landmark region

Mike Giffordrequested to merge
issue/drupal-3049125:3049125-language-switcher-block into main
  • /core/modules/language/src/Hook/LanguageThemeHooks.php
  • /core/modules/language/tests/src/Functional/LanguageSwitchingTest.php

Closes #3049125

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