add: `errorMessage` for datatable messages

npm/ng-packs/packages/theme-shared/src/lib/tokens/ngx-datatable-messages.token.ts

@@ -2,12 +2,14 @@ import { InjectionToken } from '@angular/core';
 
 export interface NgxDatatableMessages {
   emptyMessage: string;
+  errorMessage: string;
   totalMessage: string;
   selectedMessage: string;
 }
 
 export const defaultNgxDatatableMessages = {
   emptyMessage: 'AbpUi::NoDataAvailableInDatatable',
+  errorMessage: 'AbpUi::ErrorLoadingDatatable',
   totalMessage: 'AbpUi::Total',
   selectedMessage: 'AbpUi::Selected',
 };