Changed "Disk" to "Storage" which looked better when showing disk space for all storage areas.

web/skins/classic/includes/functions.php

@@ -249,7 +249,7 @@ function getNavBarHTML() {
   </div>
   <ul class="list-inline">
 	  <li><?php echo translate('Load') ?>: <?php echo getLoad() ?></li>
-	  <li><?php echo translate('Disk') ?>: <?php echo getDiskPercent() ?>%</li>
+	  <li><?php echo translate('Storage') ?>: <?php echo getDiskPercent() ?>%</li>
   </ul>
 </div> <!-- End .footer -->