<script>
(function($) {
    $(document).ready(function() {
        var footer_link = $('#footer-info > span > a'),
            lang = $('html').attr('lang');
            if (lang == 'de-DE') {
                footer_link.attr('href','/de/')
            } else {
                footer_link.attr('href','/')
            }
    });
})(jQuery);
</script>