code: function hasLanguageChanged( languageSettingValue, settings = {} ) {
  	if ( ! languageSettingValue ) {
  		return false;
  	}
  	// if there is a saved variant we know that the user is changing back to the root language === setting hasn't changed
  	// but if settings.locale_variant is not empty then we assume the user is trying to switch back to the root
  	return (
  		( languageSettingValue === settings.language && isEmpty( settings.locale_variant ) ) ||
  		//if the incoming language code is the variant itself === setting hasn't changed
  		languageSettingValue === settings.locale_variant
  	);
  }
docs: Checks if an incoming change to settings.language is a change to the existing settings
  Currently the assumption is that if a settings.locale_variant slug exists, then that is the current language
  
  @param  {String}  languageSettingValue the newly-set language slug string.
  @param  {Object}  settings user settings object.
  @return {Boolean} if the language setting has been changed.