Append param to current URL with view helper in Zend - php

Question

In my layout-script I wish to create a link, appending [?|&]lang=en to the current url, using the url view helper. So, I want this to happen:
http://localhost/user/edit/1 => http://localhost/user/edit/1?lang=en
http://localhost/index?page=2 => http://localhost/index?page=2&lang=en
I have tried the solution suggested Zend Framework: Append query strings to current page url, accessing the router directly, but that does work.
My layout-script contains:
English
If the default route is used, it will append /lang/en, but when another route is used, nothing is appended at all.
So, is there any way to do this with in Zend without me having to parse the url?
Edit
Sorry for my faulty explanation. No, I haven't made a custom router. I have just added other routes. My bad. One route that doesn't work is:
$Routes = array(
'user' => array(
'route' => 'admin/user/:mode/:id',
'defaults' => array('controller' => 'admin', 'action' => 'user', 'mode'=>'', 'id' => 0)
)
);
foreach( $Routes as $k=>$v ) {
$route = new Zend_Controller_Router_Route($v['route'], $v['defaults']);
$router->addRoute($k, $route);
}

Answer 1

Upd:
You must add wildcard to your route or define 'lang' parameter explicitly.
'admin/user/:mode/:id/*'
Additionally, according to your comment, you can do something like this:
class controllerplugin extends Zend_Controller_Plugin_Abstract
{
function routeShutdown($request)
{
if($request->getParam('lang', false) {
//store lang
Zend_Controller_Front::getInstance()->getRouter()->setGlobalParam('lang', NULL); //check if this will remove lang from wildcard parameters, have no working zf installation here to check.
}
}
}