WEB-638 fix: improve core utility logic and migrate from deprecated substr (#3062)

improve

src/app/system/manage-data-tables/edit-data-table/edit-data-table.component.ts

@@ -449,7 +449,7 @@ export class EditDataTableComponent implements OnInit {
         return 'Dropdown';
       }
       default: {
-        return columnDisplayType[0] + columnDisplayType.substr(1).toLowerCase();
+        return columnDisplayType[0] + columnDisplayType.substring(1).toLowerCase();
       }
     }
   }