Submitting the form is getting fails. This producess the below console error:
404 (Not Found)
This issue occurs only when setting the language URL format to “Language name added as a parameter“.
The solution is very simple.
Add this code to the theme’s functions.php file, found in the ../wp-content/themes/theme-name/ folder:
add_filter( 'wpcf7_load_js', '__return_false' );
Thats it 🙂