Change while with foreach for performance.

catalog/includes/classes/language.php

@@ -83,7 +83,7 @@ function get_browser_language() {
 
       for ($i=0, $n=sizeof($this->browser_languages); $i<$n; $i++) {
         reset($this->languages);
-        while (list($key, $value) = each($this->languages)) {
+      foreach($this->languages as $key => $value) {
           if (preg_match('/^(' . $value . ')(;q=[0-9]\\.[0-9])?$/i', $this->browser_languages[$i]) && isset($this->catalog_languages[$key])) {
             $this->language = $this->catalog_languages[$key];
             break 2;