Round pipe: Make it HTML in order to add class in number's size

utils/pipes/number-round.pipe.ts

@@ -18,6 +18,6 @@ export class NumberRoundPipe implements PipeTransform {
       decimal = args[1];
     }
     let size: NumberSize = NumberUtils.roundNumber(value, level, decimal);
-    return this.decimalPipe.transform(size.number) + size.size;
+    return this.decimalPipe.transform(size.number) + (size.size?'<span class="number-size">'  + size.size + '</span>':'');
   }
 }