code: func (config *Config) Locale() string {
  	if config.ConfigFile.Locale != "" {
  		return config.ConfigFile.Locale
  	}
  
  	if config.ENV.LCAll != "" {
  		return config.convertLocale(config.ENV.LCAll)
  	}
  
  	if config.ENV.Lang != "" {
  		return config.convertLocale(config.ENV.Lang)
  	}
  
  	return DefaultLocale
  }
docs: // Locale returns the locale/language the UI should be displayed in. This value
  // is based off of:
  //   1. The 'Locale' setting in the .cf/config.json
  //   2. The $LC_ALL environment variable if set
  //   3. The $LANG environment variable if set
  //   4. Defaults to DefaultLocale