implementing recommendations of scrutinizer

lib/I18n.php

@@ -135,15 +135,17 @@ class I18n
      *
      * @access public
      * @static
-     * @return void
      */
     public static function loadTranslations()
     {
         $availableLanguages = self::getAvailableLanguages();
 
         // check if the lang cookie was set and that language exists
-        if (array_key_exists('lang', $_COOKIE) && in_array($_COOKIE['lang'], $availableLanguages)) {
-            $match = $_COOKIE['lang'];
+        if (
+            array_key_exists('lang', $_COOKIE) &&
+            ($key = array_search($_COOKIE['lang'], $availableLanguages)) !== false
+        ) {
+            $match = $availableLanguages[$key];
         }
         // find a translation file matching the browsers language preferences
         else {
@@ -256,7 +258,6 @@ class I18n
      * @access public
      * @static
      * @param  string $lang
-     * @return void
      */
     public static function setLanguageFallback($lang)
     {