You can delete a language you no longer need. If you don't want to delete a language, you can disable it. See Enabling or disabling a language
  1. Go to User Experience > Languages.
  2. In the list, locate the language you want to delete.

    You cannot delete the provided languages or the default language, but you can delete any custom language.

  3. On the right side, click the More Options menu (⠇) and then click Remove.
  4. In the confirmation message, click Delete.