Hello,

Your issue has been solved. I have deactivated the Loco translate plugin from your site. There is no need for that plugin because you are already using the WPML plugin. Now you can easily translate all the strings of the theme from the link below:
https://giftsgroup.com.pl/wp-admin/admin.php?page=wpml-string-translation/menu/string-translation.php

I have changed the word Browse Categories and it is showing fine on the front end. Please check the site after removing the browser cache.

Best Regards.