Force sanitize function to use UTF8 (for php lower than 5.4)

lib/template.php

@@ -326,7 +326,7 @@ class OC_Template{
 	 * This function is internally used to sanitize HTML.
 	 */
  	private static function sanitizeHTML( &$value ){
- 			$value = htmlentities( $value );
+ 			$value = htmlentities( $value , ENT_QUOTES, 'UTF-8'); //Specify encoding for PHP<5.4
  			return $value;
     }