Custom message from Contact Form 7 for acceptance

###############################
### Paste in functions.php ###
#############################

/**
 * Custom message from Contact Form 7 for acceptance
 * @link https://pastebin.com/4nsdh9Fk
 * @see my_wpcf7_form_acceptance
 * @param $replaced
 * @param $submitted
 * @param $html
 * @param $mail_tag
 * @return string
 */
function my_wpcf7_form_acceptance( $replaced, $submitted, $html, $mail_tag ) {

    $form_tag = $mail_tag->corresponding_form_tag();
    if ( ! $form_tag ) {
        return $replaced;
    }

    /** My translation */
    if ( ! empty( $submitted ) ) {
        $replaced = 'Checked';
    } else {
        $replaced = 'Not checked';
    }

    $content = empty( $form_tag->content )
        ? (string) reset( $form_tag->values )
        : $form_tag->content;

    if ( ! $html ) {
        $content = wp_strip_all_tags( $content );
    }

    $content = trim( $content );
    if ( $content ) {
        $replaced = sprintf( '%1$s: %2$s', $replaced, $content );
    }

    return $replaced;
}
add_filter( 'wpcf7_mail_tag_replaced_acceptance', 'my_wpcf7_form_acceptance', 10, 4 );