Changed one string that was breaking 1.6 hotpot module.

lang/es/hotpot.php

@@ -55,7 +55,7 @@
 $string['navigation_buttons'] = 'Botones de Hot Potatoes';
 $string['navigation_frame'] = 'Marco de navegación de Moodle';
 $string['navigation_give_up'] = 'Solamente un botón de \"Abandonar\" ';
-$string['navigation_iframe'] = '<IFRAME> embebido';
+$string['navigation_iframe'] = '&lt;IFRAME&gt;> embebido';
 $string['navigation_none'] = 'Ninguna';
 $string['neverclosed'] = 'Nunca cerrado';
 $string['noactivity'] = 'No hay actividad';