Format transaction count numbers.

frontend/src/app/components/address/address.component.html

@@ -42,7 +42,7 @@
 
     <br>
 
-    <h2><ng-template [ngIf]="transactions?.length">{{ transactions?.length || '?' }} of </ng-template>{{ txCount }} transactions</h2>
+    <h2><ng-template [ngIf]="transactions?.length">{{ (transactions?.length | number) || '?' }} of </ng-template>{{ txCount | number }} transactions</h2>
 
     <app-transactions-list [transactions]="transactions" [showConfirmations]="true" (loadMore)="loadMore()"></app-transactions-list>