QUESTION How to change menu active label?

[bacmid]

I found the file, it's admin/inc/theme_functions.php:
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if ($page['menuStatus'] == 'Y') {
$parentClass = !empty($page['parent']) ? $classPrefix.$page['parent'] . " " : "";
$classes = trim( $parentClass.$classPrefix.$url_nav);
if ("$currentpage" == "$url_nav") $classes .= " current active";
if ($page['menu'] == '') { $page['menu'] = $page['title']; }
if ($page['title'] == '') { $page['title'] = $page['menu']; }
$menu .= '<li class="'. $classes .'"><a href="'. find_url($page['url'],$page['parent']) . '" title="'. encode_quotes(cl($page['title'])) .'">'.strip_decode($page['menu']).'</a></li>'."\n";
}