Querying multiple taxonomies in URL leads to wrong taxonomy archive

Managed to do it by putting this into the loop:

<?php if (has_term( $_GET["lang"], 'sprache' )) { ?>

I was then able to creat links like …/autor/steve-perry/?lang=englisch to filter the search results the way I wanted to.

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)