code: def supported_languages(self, task=None):
      
      if task:
        collection = self.get_collection(task=task)
        return [isoLangs[x.id.split('.')[1]]["name"]
                                           for x in collection.packages]
      else:
        return [x.name.split()[0] for x in self.collections()
                                           if Downloader.LANG_PREFIX in x.id]
docs: Languages that are covered by a specific task.
  
      Args:
        task (string): Task name.