friendica-directory/src/templates/widget/popularlanguages.phtml

<div>
    <h3><?php echo $this->__('Popular Languages')?></h3>
    <ul>
		<?php foreach ($languages as $language): ?>
            <li>
                <a href="search?field=language&q=<?php echo $this->escapeUrl($language['language']) ?>">
					<?php echo $this->e(Friendica\Directory\Utils\L10n::localeToLanguageString($language['language'])) ?>
                </a>
            </li>
		<?php endforeach; ?>
    </ul>
</div>