Migrate to DBPLitElement

packages/data-table-view/src/dbp-data-table-view-demo.js

 import {AuthKeycloak, LoginButton} from '@dbp-toolkit/auth';
 import {DataTableView} from './data-table-view.js';
 import {i18n} from './i18n';
-import {css, html, LitElement} from 'lit-element';
+import {css, html} from 'lit-element';
 import {ScopedElementsMixin} from '@open-wc/scoped-elements';
 import * as commonUtils from '@dbp-toolkit/common/utils';
 import * as commonStyles from '@dbp-toolkit/common/styles';
+import DBPLitElement from "@dbp-toolkit/common/dbp-lit-element";
 
-export class DataTableViewDemo extends ScopedElementsMixin(LitElement) {
+export class DataTableViewDemo extends ScopedElementsMixin(DBPLitElement) {
     constructor() {
         super();
         this.lang = 'de';