added new translation key

ui-ngx/src/app/modules/home/components/widget/lib/timeseries-table-widget.component.html

@@ -47,7 +47,7 @@
             <table mat-table [dataSource]="source.timeseriesDatasource" [trackBy]="trackByRowTimestamp"
                        matSort [matSortActive]="source.pageLink.sortOrder.property" [matSortDirection]="source.pageLink.sortDirection()" matSortDisableClear>
               <ng-container *ngIf="showTimestamp" [matColumnDef]="'0'">
-                <mat-header-cell *matHeaderCellDef mat-sort-header>{{ 'widgets.table.display-timestamp' | translate }}</mat-header-cell>
+                <mat-header-cell *matHeaderCellDef mat-sort-header>{{ 'widgets.table.timestamp-column-name' | translate }}</mat-header-cell>
                 <mat-cell *matCellDef="let row; let rowIndex = index"
                           [innerHTML]="cellContent(source, null, 0, row, row[0], rowIndex) | async"
                           [style]="cellStyle(source, null, 0, row, row[0], rowIndex) | async">

ui-ngx/src/app/modules/home/components/widget/lib/timeseries-table-widget.component.ts

@@ -513,7 +513,7 @@ export class TimeseriesTableWidgetComponent extends PageComponent implements OnI
         let title = '';
         const header = this.sources[index].header.find(column => column.index.toString() === value);
         if (value === '0') {
-          title = this.translate.instant('widgets.table.display-timestamp');
+          title = this.translate.instant('widgets.table.timestamp-column-name');
         } else if (value === 'actions') {
           title = 'Actions';
         } else {

ui-ngx/src/assets/locale/locale.constant-en_US.json

@@ -8973,6 +8973,7 @@
             "show-empty-space-hidden-action": "Show empty space instead of hidden cell button action",
             "dont-reserve-space-hidden-action": "Don't reserve space for hidden action buttons",
             "display-timestamp": "Timestamp",
+            "timestamp-column-name":"Timestamp",
             "display-pagination": "Display pagination",
             "default-page-size": "Default page size",
             "page-step-settings": "Page step settings",