Add this to your wp-config.php file `define(‘WP_HOME’,’http://xn--canyoningallgu-iib.de/’);
Then go into admin and change stuff back to what it should be. You should then remove the lines you just added to your config file. The reason you want to remove those lines after you fix it is because it will override the settings in your admin panel. That should fix it 🙂
It seem you are using a commercial theme (‘salient’) and you will need to request theme specific support for your theme from where you purchased it. WordPress.org only supports free themes that were downloaded from this site.