code: def add_genstrings_comments_to_file(localization_file, genstrings_err):
      
  
      errors_to_log = [line for line in genstrings_err.splitlines() if "used with multiple comments" not in line]
  
      if len(errors_to_log) > 0:
          logging.warning("genstrings warnings:\n%s", "\n".join(errors_to_log))
  
      loc_file = open_strings_file(localization_file, "a")
  
      regex_matches = re.findall(r'Warning: Key "(.*?)" used with multiple comments ("[^"]*" (& "[^"]*")+)',
                                 genstrings_err)
  
      logging.info("Adding multiple comments from genstrings output")
      for regex_match in regex_matches:
          if len(regex_match) == 3:
              key = regex_match[0]
              comments = [comment.strip()[1:-1] for comment in regex_match[1].split("&")]
  
              logging.info("Found key with %d comments: %s", len(comments), key)
  
              loc_key = LocalizationEntry(comments, key, key)
  
              loc_file.write(unicode(loc_key))
              loc_file.write(u"\n")
  
      loc_file.close()
docs: Adds the comments produced by the genstrings script for duplicate keys.
  
      Args:
          localization_file (str): The path to the strings file.