Load in translations if they are set, and add the default locale as
        well.

def _prepare_translations(self):
        """Load in translations if they are set, and add the default locale as
        well.

        """
        if config.TRANSLATIONS in self.paths:
            LOGGER.info('Loading translations from %s',
                        self.paths[config.TRANSLATIONS])
            from tornado import locale
            locale.load_translations(self.paths[config.TRANSLATIONS])
            if config.DEFAULT_LOCALE in self._config:
                LOGGER.info('Setting default locale to %s',
                            self._config[config.DEFAULT_LOCALE])
                locale.set_default_locale(self._config[config.DEFAULT_LOCALE])