code: def _create_index_content(words):
      
      content = ["<h1>Index</h1>", "<ul>"]
      for word in words:
          content.append(
              '<li><a href="translations/{word}.html">{word}</a></li>'.format(word=word)
          )
  
      content.append("</ul>")
      if not words:
          content.append("<i>Nothing to see here ...yet!</i>")
  
      return "\n".join(content)
docs: Create html string of index file.
  
      Parameters
      ----------
      words : list of str
          List of cached words.
  
      Returns
      -------
      str
          html string.