Add dbp-translated web component

packages/common/src/translated.js

+import {css, html} from 'lit-element';
+import {ScopedElementsMixin} from '@open-wc/scoped-elements';
+import {AdapterLitElement} from "@dbp-toolkit/provider/src/adapter-lit-element";
+import {classMap} from "lit-html/directives/class-map";
+
+export class Translated extends ScopedElementsMixin(AdapterLitElement) {
+    constructor() {
+        super();
+        this.lang = 'de';
+    }
+
+    static get properties() {
+        return {
+            ...super.properties,
+            lang: { type: String },
+        };
+      }
+
+    static get styles() {
+        // language=css
+        return css`
+            .hidden {display: none}
+        `;
+    }
+
+    render() {
+        return html`
+            <slot class="${classMap({hidden: this.lang !== 'de'})}" name="de"></slot>
+            <slot class="${classMap({hidden: this.lang !== 'en'})}" name="en"></slot>
+        `;
+    }
+}