UI: Improve time series charts labels rendering and size calculation.

ui-ngx/src/app/modules/home/components/widget/lib/chart/time-series-chart.ts

@@ -588,6 +588,7 @@ export class TbTimeSeriesChart {
 
   private drawChart() {
     echartsModule.init();
+    this.renderer.setStyle(this.chartElement, 'letterSpacing', 'normal');
     this.timeSeriesChart = echarts.init(this.chartElement,  null, {
       renderer: 'canvas'
     });