Craft not generating language links correctly
In a multilingual site, your siteUrl config setting in /craft/config/general.php needs to be an array where the keys correspond to your installed locales:

return array(
    // ...
    'siteUrl' =&gt; array(
        'no' =&gt; 'http://example.com/',
        'en_us' =&gt; 'http://example.com/en/',
    ),
);