CakePHP setflash page refresh doesn't keep language in url - cakephp

Question

I have a multi language website, but when I don't do a redirect with a setFlash, it deletes the language from the url. Example: if the contactform doesn't validate, it just does a setFlash without the redirect, so that user input data is not lost. But it does refresh the page and deletes the language part from my url. This does not happen when I do a redirect after my setFlash, because I give the language param with the redirect. Work flow:
I start on the page website.com/eng/contact (notice the language part). I fill in the contact form and fill in all required inputs. It redirects me to website.com/eng/contact/send. That's great and what I want. But when I don't give an valid email adres for example, it display an error (great), but the url has changed to website.com/forms/contact (notice the missing language part, and it doesn't use my routes). What am I doing wrong? My code:
Formscontroller.php
public function contact() {
if ($this->request->is('post')) {
$this->Form->set($this->request->data);
if ($this->Form->validates()) {
if($this->Form->save($this->request->data)){
$this->redirect(array('controller' => 'forms', 'action' => 'contact_success', 'language' => $this->Session->read('Config.language')));
} else {
$this->Session->setFlash(__('Er ging iets mis met het versturen van uw contactformulier, probeer het opnieuw.'), 'flash_error');
}
} else {
$this->Session->setFlash(__('Niet alle verplichte velden zijn ingevuld.'), 'flash_error');
}
}
}
routes.php
Router::connect('/:language/pages/*', array('controller' => 'pages', 'action' => 'display'));
Router::connect('/:language/contact', array('controller' => 'forms', 'action' => 'contact'), array('language' => 'ned|eng'));
Router::connect('/:language/contact/verzonden', array('controller' => 'forms', 'action' => 'contact_success'), array('language' => 'ned'));
Router::connect('/:language/contact/send', array('controller' => 'forms', 'action' => 'contact_success'), array('language' => 'eng'));
Router::connect('/', array('controller' => 'pages', 'action' => 'display', 'home'));
Router::connect('/:language', array('controller' => 'pages', 'action' => 'display', 'home'), array('language' => 'eng|ned'));
Router::connect('/:language/:controller/:action/*', array(), array('language' => '[a-z]{3}'));
CakePlugin::routes();
require CAKE . 'Config' . DS . 'routes.php';

Answer 1

I was looking in the wrong direction for my problem. As ndm points out in his comment on my question, it had to do with the action of my form, it didn't have the language part in it. So thanks to ndm for pointing me in the right direction!