Language file "acp/styles.php" contains many unused language entries

As per the title , the styles.php file contains many old entries, and i doubt that those language variables are used by mod writers.

For example ; http://code.phpbb.com/repositories/revision/phpbb/7562
That commit have deleted some language entries, and IMO it is quit useless and quit painless to translate those, since you can not test it since it is not used anywhere.