reset grecaptcha in case of error

public/static/js/rvr.js

@@ -64,6 +64,9 @@ var RVR = {
 
                     formError.style.display = 'block';
                     formError.innerHTML = this.response.error.errorText;
+                    if (typeof grecaptcha !== 'undefined') {
+                        grecaptcha.reset();
+                    }
 
                     return;
                 }