code: def install_language(cls, language_code):
          
          # Skip if the language is already installed
          if language_code == cls.language:
              return
          try:
              cls._active_catalogs = cls._translation_catalogs[language_code]
              cls.language = language_code
              log.debug('Installed language %s', language_code)
          except KeyError:
              default = settings.DEFAULT_LANG
              log.warning('Unknown language %s, falling back to %s', language_code, default)
              cls._active_catalogs = cls._translation_catalogs[default]
              cls.language = default
docs: Install the translations for language specified by `language_code`.
  
          If we don't have translations for this language, then the default language will be used.
  
          If the language specified is already installed, then this is a no-op.