SUPPORT-8724: fix + remove locale parameter

frontend/src/ts/ervu_business_metrics/formatter/NumberToLocalStringFormatter.ts

@@ -1,10 +1,11 @@
 import {TextFormatter} from "@webbpm/base-package";
 
 export class NumberToLocalStringFormatter implements TextFormatter {
-  public locale: string;
-
   format(value: string): string {
+    if (!value) {
+      return  value;
+    }
     const numberValue = Number(value);
-    return this.locale ? numberValue.toLocaleString(this.locale) : numberValue.toLocaleString();
+    return numberValue ? numberValue.toLocaleString() : value;
   }
 }