code: def _language_to_voice_code(self, language):
          
          voice_code = self.rconf[RuntimeConfiguration.TTS_VOICE_CODE]
          if voice_code is None:
              try:
                  voice_code = self.LANGUAGE_TO_VOICE_CODE[language]
              except KeyError as exc:
                  self.log_exc(u"Language code '%s' not found in LANGUAGE_TO_VOICE_CODE" % (language), exc, False, None)
                  self.log_warn(u"Using the language code as the voice code")
                  voice_code = language
          else:
              self.log(u"TTS voice override in rconf")
          self.log([u"Language to voice code: '%s' => '%s'", language, voice_code])
          return voice_code
docs: Translate a language value to a voice code.
  
          If you want to mock support for a language
          by using a voice for a similar language,
          please add it to the ``LANGUAGE_TO_VOICE_CODE`` dictionary.
  
          :param language: the requested language
          :type  language: :class:`~aeneas.language.Language`
          :rtype: string