When lang.php saves the translation file, it converts HTML entities like < and > into < and > characters. This may produce critical error in parsing XML/XHTML document.
It is necessary to preserve HTML entites "as they are" without any transformation.
- will help resolve
MDL-8499 Keep and   as a part of translation string
CONTRIB-3405 <IFRAME> should be encoded using HTML entities in lang/pt_br/hotpot.php