code: def init (domain, directory, loc=None):
      
      global default_language, default_encoding, default_domain, default_directory
      default_directory = directory
      default_domain = domain
      if os.path.isdir(directory):
          # get supported languages
          for lang in os.listdir(directory):
              path = os.path.join(directory, lang, 'LC_MESSAGES')
              mo_file = os.path.join(path, '%s.mo' % domain)
              if os.path.exists(mo_file):
                  supported_languages.add(lang)
      if loc is None:
          loc, encoding = get_locale()
      else:
          encoding = get_locale()[1]
      if loc in supported_languages:
          default_language = loc
      else:
          default_language = "en"
      # Even if the default language is not supported, the encoding should
      # be installed. Otherwise the Python installation is borked.
      default_encoding = encoding
      install_language(default_language)
docs: Initialize this gettext i18n module. Searches for supported languages
      and installs the gettext translator class.