Problems with Localized Site Navigation
A multi-environment config needs to have a * key. This might work:

return array(
  '*' =&gt; array(),
  'craft.dev' =&gt; array(
    'siteUrl' =&gt; array(
      'de' =&gt; 'http://craft.dev/',
       en' =&gt; 'http://craft.dev/en/',
    ),
  ),
);