Documentation

Introduced in Version 11, this filter allows the preferred language for the ReCaptcha for element to be changed.

function my_recaptcha_lang( $lang ) {
    // Language codes are listed at https://developers.google.com/recaptcha/docs/language
    return 'de';
}
add_filter( 's2_recaptcha_lang', 'my_recaptcha_lang' );