person-select: one i18next instance per element

packages/person-select/src/dbp-person-select-demo.js

-import {i18n} from './i18n.js';
+import {createInstance} from './i18n.js';
 import {css, html} from 'lit-element';
 import {ScopedElementsMixin} from '@open-wc/scoped-elements';
 import {PersonSelect} from './person-select.js';
@@ -10,7 +10,8 @@ import DBPLitElement from "@dbp-toolkit/common/dbp-lit-element";
 export class PersonSelectDemo extends ScopedElementsMixin(DBPLitElement) {
     constructor() {
         super();
-        this.lang = 'de';
+        this._i18n = createInstance();
+        this.lang = this._i18n.language;
         this.entryPointUrl = '';
         this.noAuth = false;
     }
@@ -32,14 +33,6 @@ export class PersonSelectDemo extends ScopedElementsMixin(DBPLitElement) {
         };
     }
 
-    connectedCallback() {
-        super.connectedCallback();
-        i18n.changeLanguage(this.lang);
-
-        this.updateComplete.then(()=>{
-        });
-    }
-
     static get styles() {
         // language=css
         return [
@@ -52,6 +45,13 @@ export class PersonSelectDemo extends ScopedElementsMixin(DBPLitElement) {
         ];
     }
 
+    update(changedProperties) {
+        if (changedProperties.has("lang")) {
+            this._i18n.changeLanguage(this.lang);
+        }
+        super.update(changedProperties);
+    }
+
     getAuthComponentHtml() {
         return this.noAuth ? html`<dbp-login-button subscribe="auth" lang="${this.lang}" show-image></dbp-login-button>` : html`
             <div class="container">

packages/person-select/src/i18n.js

-import {createInstance} from '@dbp-toolkit/common/i18next.js';
+import {createInstance as _createInstance} from '@dbp-toolkit/common/i18next.js';
 
 import de from './i18n/de/translation.json';
 import en from './i18n/en/translation.json';
 
-export const i18n = createInstance({en: en, de: de}, 'de', 'en');
\ No newline at end of file
+export function createInstance() {
+    return _createInstance({en: en, de: de}, 'de', 'en');
+}
\ No newline at end of file

packages/person-select/src/person-select.js

@@ -6,7 +6,7 @@ import select2LangEn from './i18n/en/select2';
 import JSONLD from '@dbp-toolkit/common/jsonld';
 import {css, html} from 'lit-element';
 import {ScopedElementsMixin} from '@open-wc/scoped-elements';
-import {i18n} from './i18n.js';
+import {createInstance} from './i18n.js';
 import {Icon} from '@dbp-toolkit/common';
 import * as commonUtils from '@dbp-toolkit/common/utils';
 import * as commonStyles from '@dbp-toolkit/common/styles';
@@ -29,7 +29,8 @@ export class PersonSelect extends ScopedElementsMixin(AdapterLitElement) {
         super();
         Object.assign(PersonSelect.prototype, errorUtils.errorMixin);
         this.auth = {};
-        this.lang = 'de';
+        this._i18n = createInstance();
+        this.lang = this._i18n.language;
         this.entryPointUrl = '';
         this.jsonld = null;
         this.$select = null;
@@ -129,6 +130,7 @@ export class PersonSelect extends ScopedElementsMixin(AdapterLitElement) {
      * @param ignorePreset
      */
     initSelect2(ignorePreset = false) {
+        const i18n = this._i18n;
         const that = this;
         const $this = $(this);
 
@@ -277,7 +279,7 @@ export class PersonSelect extends ScopedElementsMixin(AdapterLitElement) {
         changedProperties.forEach((oldValue, propName) => {
             switch (propName) {
                 case "lang":
-                    i18n.changeLanguage(this.lang);
+                    this._i18n.changeLanguage(this.lang);
 
                     if (this.select2IsInitialized()) {
                         // no other way to set an other language at runtime did work
@@ -361,6 +363,7 @@ export class PersonSelect extends ScopedElementsMixin(AdapterLitElement) {
     }
 
     render() {
+        const i18n = this._i18n;
         const select2CSS = commonUtils.getAssetURL(select2CSSPath);
         return html`
             <link rel="stylesheet" href="${select2CSS}">