code: func (c *ResTableConfig) Locale() string {
  	if c.Language[0] == 0 {
  		return ""
  	}
  	if c.Country[0] == 0 {
  		return fmt.Sprintf("%c%c", c.Language[0], c.Language[1])
  	}
  	return fmt.Sprintf("%c%c-%c%c", c.Language[0], c.Language[1], c.Country[0], c.Country[1])
  }
docs: // Locale returns the locale of the configuration.