Fix chart x-axes ticks

static/chart.html

@@ -32,6 +32,13 @@
                 responsive: true,
                 legend: {
                     display: false
+                },
+                scales: {
+                    xAxes: [{
+                        ticks: {
+                            precision: 0
+                        }
+                    }],
                 }
             }
         });