common: add i18next-scanner support

packages/common/dbp-common-demo.js

-import {createInstance} from './i18n.js';
+import {createInstance} from './src/i18n.js';
 import {css, html, LitElement} from 'lit-element';
 import {ScopedElementsMixin} from '@open-wc/scoped-elements';
 import * as commonUtils from './utils.js';

packages/common/i18next-scanner.config.js

+module.exports = {
+    input: [
+        'src/*.js',
+        './*.js',
+    ],
+    output: './',
+    options: {
+        debug: false,
+        removeUnusedKeys: true,
+        func: {list: ['i18n.t', '_i18n.t']},
+        lngs: ['en','de'],
+        resource: {
+            loadPath: 'src/i18n/{{lng}}/{{ns}}.json',
+            savePath: 'src/i18n/{{lng}}/{{ns}}.json'
+        },
+    },
+}

packages/common/jsonld.js

 import {send as notify} from './notification';
 import * as utils from "./utils";
-import {createInstance} from "./i18n";
+import {createInstance} from "./src/i18n";
 
 export default class JSONLD {
     constructor(baseApiUrl, entities) {

packages/common/package.json

@@ -25,9 +25,11 @@
     "rollup": "^2.33.3",
     "rollup-plugin-copy": "^3.1.0",
     "rollup-plugin-delete": "^2.0.0",
-    "rollup-plugin-serve": "^1.0.1"
+    "rollup-plugin-serve": "^1.0.1",
+    "i18next-scanner": "^3.0.0"
   },
   "scripts": {
+    "i18next": "i18next-scanner",
     "clean": "rm dist/*",
     "build": "rollup -c",
     "build-test": "rollup -c --environment BUILD:test",

packages/common/i18n.js → packages/common/src/i18n.js

-import {createInstance as _createInstance} from './i18next.js';
+import {createInstance as _createInstance} from '../i18next.js';
 
 import de from './i18n/de/translation.json';
 import en from './i18n/en/translation.json';