docs: def normalize(code):
      """
      Normalize language codes to ISO 639-2. If all conversions fails, return the
      `code` as it was given.
  
      Args:
          code (str): Language / country code.
  
      Returns:
          str: ISO 639-2 country code.
      """
      if len(code) == 3:
          return code
  
      normalized = translate(code)
  
      if normalized:
          return normalized
  
      country = countries.get(code, None)
  
      if country:
          return country.alpha3.lower()
  
      return code