Provide node language for rendered links

If a View contains nodes which aren't of the current language, the URL when choosing "Link this field to it's node" will be the unaliased path. For example, when browsing English pages, all French nodes will be displayed as 'fr/node/123' instead of 'fr/alias'.

The attached patch adds the language field to the Node query, and allows other modules to set $this->options['alter']['language'] to set the language for a link.