Fixing broken routing due to missing language parameter.

When a URL to an article is supposed to be generated for another language than the current one, this fails due to Joomla not using the language parameter for ContentHelperRoute::getArticleRoute() right now. This normally rarely happens, since you can only see articles for your current language or for the '*' language, but when using smart search, you get results for all languages. Due to this bug, the links to non-'*'-language articles are however wrong. This fixes this.