debugging rsvp-submit.php

public/rsvp-submit.php

@@ -207,6 +207,16 @@ EOD;
 
     $mail->send();
 
+    $lang = $_POST['lang'] ?? 'en';
+
+$allowedLangs = ['en', 'de', 'ru'];
+
+if (!in_array($lang, $allowedLangs, true)) {
+    $lang = 'en';
+}
+
+header("Location: /{$lang}/thank-you/");
+exit;
     header('Location: /thank-you/');
     exit;