How to get taxonomy slug

Probably a stupid question – How to get taxonomy slug in a WP template; not slugs of taxonomy values but slug attached to the taxonomy name with Qtranslate Slug plugin (https://www.ads-software.com/plugins/qtranslate-slug/) :

https://s.www.ads-software.com/plugins/qtranslate-slug/screenshot-4.png?r=826556

I tried:

<?php
$yourtax = get_taxonomy ('document-language');
echo $yourtax -> slug?>

but doesn’t work