How to show ISO codes only?

Hi.

When i show langs in wordpress theme, i want to show only iso codes, like ES EN FR.

I write mod to use <?php echo qtrans_generateLanguageSelectCode(‘iso’); ?> but doesn’t work, it shows empty.

mqtranslate_widget.php line 82 after break;

case 'iso':
        echo '<ul class="qtrans_language_chooser" id="'.$id.'">';
				foreach(qtrans_getSortedLanguages() as $language) {
					echo '<li';
					if($language == $q_config['language'])
						echo ' class="active"';
					echo '><a href="'.qtrans_convertURL($url, $language).'"';
					echo ' class="qtrans_iso" title="'.$q_config['language_name'][$language].'"';
					echo '><span>'.$language.'</span></a></li>';
				}
				echo "</ul><div class=\"qtrans_widget_end\"></div>";
				break;

and mqtranslate_widget.inc.php line 35
if($type!='text'&&$type!='image'&&$type!='both'&&$type!='dropdown'&&$type!='iso') $type='text';

https://wordpress.org/plugins/mqtranslate/