Rewrite of URLs used in themes causes 404 on image loading

I currently installed Polylang (newest) to WordPress (newest) and recognized, that images used in my template will be rewritten by polylang.

If the imageURL is

http://localhost/site/wp-content/themes/Evelin/images/a_image.png

polylang changes it to:

http://localhost/site/de/wp-content/themes/Evelin/images/a_image.png

(it adds the language code to the url (de, en, …) before wp-content.

This causes a 404 because the images can not be loaded. I try to find some hint in the documentation and this forum, but could not find something helpful for me.

Maybe i forgot something….

Thanks
Sascha

https://wordpress.org/plugins/polylang/