Switch languages links

I have the following routes:
Router::connect("/:lang", array('controller' => 'pages', 'slug' =>
'home'), array('lang' => '[a-z]{3}', 'pass' => array('slug')));
Router::connect("/:lang/:controller", array(), array('lang' => '[a-
z]{3}', 'pass' => array('slug')));
Router::connect("/:lang/:controller/:slug", array(), array('lang'
=> '[a-z]{3}', 'pass' => array('slug')));

Router::connect('/', array('controller' => 'pages', 'slug' =>
'home'), array('pass' => array('slug')));
Router::connect("/:controller/:slug", array('action' => 'index'),
array('pass' => array('slug')));

And I need to generate the language switch links, I try this

$languages = array('French' => 'fre', 'English' => 'eng');

foreach($languages as $lang => $alias){
if($alias == Configure::read('Config.language')) continue;
echo $this->Html->link($lang, array_merge($this->passedArgs,
array('lang' => $alias)));
}

but I get links with the action inside them and the lang goes as named
parameter (ex. `/posts/index/post1/lang:eng`) and it should be `/eng/
posts/post1`

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