code: def has_translation(self, language_code=None, related_name=None):
          
          if language_code is None:
              language_code = self._current_language
              if language_code is None:
                  raise ValueError(get_null_language_error())
  
          meta = self._parler_meta._get_extension_by_related_name(related_name)
  
          try:
              # Check the local cache directly, and the answer is known.
              # NOTE this may also return newly auto created translations which are not saved yet.
              return not is_missing(self._translations_cache[meta.model][language_code])
          except KeyError:
              # If there is a prefetch, will be using that.
              # However, don't assume the prefetch contains all possible languages.
              # With Django 1.8, there are custom Prefetch objects.
              # TODO: improve this, detect whether this is the case.
              if language_code in self._read_prefetched_translations(meta=meta):
                  return True
  
              # Try to fetch from the cache first.
              # If the cache returns the fallback, it means the original does not exist.
              object = get_cached_translation(self, language_code, related_name=related_name, use_fallback=True)
              if object is not None:
                  return object.language_code == language_code
  
              try:
                  # Fetch from DB, fill the cache.
                  self._get_translated_model(language_code, use_fallback=False, auto_create=False, meta=meta)
              except meta.model.DoesNotExist:
                  return False
              else:
                  return True
docs: Return whether a translation for the given language exists.
          Defaults to the current language code.
  
          .. versionadded 1.2 Added the ``related_name`` parameter.