Add multiple translation text domains to Zend\Navigation

[shadowdani]

Add a new option "textdomain" to a navigation page. If present, the navigation view helper passes it to the translator, allowing for multiple text domains in one container/navigation block.

Example config:

'navigation' => array(
    'default' => array(
        'page1' => array(
            'label'      => 'Page 1',
            'route'      => 'page1',
            'textdomain' => 'MyFirstModule'
        ),
        'page2' => array(
            'label'      => 'Page 2',
            'route'      => 'page2',
            'textdomain' => 'MySecondModule'
        ),
    )
)