DVWA reCAPTCHA key: Missing

change:

$_DVWA[ 'recaptcha_public_key' ]  = ' ';

$_DVWA[ 'recaptcha_private_key' ] = ' ';

into

$_DVWA[ 'recaptcha_public_key' ]  = '6LdK7xITAAzzAAJQTfL7fu6I-0aPl8KHHieAT_yJg';

$_DVWA[ 'recaptcha_private_key' ] = '6LdK7xITAzzAAL_uw9YXVUOPoIHPZLfw2K1n5NVQ';