Add html entities to language link in header.

git-svn-id: https://simplesamlphp.googlecode.com/svn/trunk@102 44740490-163a-0410-bde0-09ae8108e29a

templates/default/includes/header.php

@@ -64,7 +64,7 @@ foreach ($languages AS $lang => $current) {
 	if ($current) {
 		echo $langnames[$lang] . ' | ';
 	} else {
-		echo '<a href="' . SimpleSAML_Utilities::addURLparameter(SimpleSAML_Utilities::selfURL(), 'language=' . $lang) . '">' . 
+		echo '<a href="' . htmlspecialchars(SimpleSAML_Utilities::addURLparameter(SimpleSAML_Utilities::selfURL(), 'language=' . $lang)) . '">' . 
 			$langnames[$lang] . '</a> | ';
 	}
 }