Hi
this is what I did and it seems to work for now, but when the plugin gets an update, this tiny mod is going to get lost unless this is fixed by the author once and for good.
Edit wp-recaptcha-integration.php and go to line 407.
Where it says
<script src=”https://www.google.com/recaptcha/api.js?onload=recaptchaLoadCallback&render=explicit” async defer></script>…..
add the &hl=XX (where XX is your language code) after the &render=explicit so it becomes
<script src=”https://www.google.com/recaptcha/api.js?onload=recaptchaLoadCallback&render=explicit&hl=XX” async defer></script>…. (remember to change XX with your language code)
Language selection will be available in the next version, coming in a few days. If you can’t wait for: the feature is already in the GitHub repo: https://github.com/mcguffin/wp-recaptcha-integration
Documentation can be found here: https://github.com/mcguffin/wp-recaptcha-integration/wiki/The-Language-Setting
Cheers,
jörn