Ok, I found solution. In layer.php comment this line:
$description = htmlspecialchars(@$this->content['description']);
and paste this one:
$description = html_entity_decode(html_entity_decode(@$this->content['description'], ENT_QUOTES | ENT_HTML5, "ISO-8859-15"));
There is double conversion as you can see, and that is only way I found. Maybe there is better way, but my PHP knowlage is very limited.