Hi webdojo
Actually, GK Quark has a position called 'lang' but it's placed in below part of a page, you can open this file:
/templates/gk_quark/layouts/default.php
This is snippet of code which renders this lang position at approx line 396:
<?php if($this->API->modules('lang')) : ?>
<div id="gkLang">
<div class="gkPage">
<jdoc:include type="modules" name="lang" style="gk_style" />
</div>
</div>
<?php endif; ?>
You can move this code to the place that you want to show lang position, then assign Language Switcher module to this position.
Hope this helps.
Regards