align legend to plotArea bottom

HTML

<script src="http://highcharts.com/js/testing.js"></script>
<div id="container" style="height: 400px"></div>

JavaScript

var chart = new Highcharts.Chart({

    chart: {
        renderTo: 'container',
        events: {
            load: function() {
                var legend = $('#container .highcharts-legend');
                var x = legend.position().left;
                var y = legend.position().top - (this.chartHeight - this.plotTop - this.plotHeight - this.options.chart.spacingBottom);

                legend.attr({
                    transform: 'translate(' + x + ',' + y + ')'
                });
            }
        }
    },
    title: {
        text: 'Test Title'
    },
    subtitle: {
        text: 'Test SubTitle'
    },
    legend: {
        align: 'right',
        verticalAlign: 'bottom'
    },
    yAxis: {
        title: {
            text: ''
        }
    },



    xAxis: {
        title: {
            text: 'x-axis title'
        },
        categories: ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']
    },

    series: [{
        data: [29.9, 71.5, 106.4, 129.2, 144.0, 176.0, 135.6, 148.5, 216.4, 194.1, 95.6, 54.4]}]
});