fix sonar findings and translation structure

test-support/i18n.js

@@ -1,31 +1,21 @@
 import fs from 'node:fs/promises';
 import path from 'node:path';
 import vm from 'node:vm';
+import { localizeHtml } from '../scripts/localize-html.js';
 
 const root = path.resolve(import.meta.dirname, '..');
 
 export async function loadI18n(context) {
-  for (const name of ['texts-de', 'i18n']) {
+  for (const name of ['texts-de', 'texts-en', 'i18n']) {
     const filename = path.join(root, `public/js/${name}.js`);
     vm.runInNewContext(await fs.readFile(filename, 'utf8'), context, { filename });
   }
   return context.Wegwichtel.I18n;
 }
 
-const escapeText = value => value.replaceAll('&', '&amp;').replaceAll('<', '&lt;').replaceAll('>', '&gt;');
-
 export async function localizedHtml(source) {
   const i18n = await loadI18n({});
-  let result = source.replace(/(<[^>]+\bdata-i18n="([^"]+)"[^>]*>)([^<]*)(<\/)/g,
-    (_match, opening, key, _text, closing) => opening + escapeText(i18n.t(key)) + closing);
-  result = result.replace(/<[^>]+>/g, opening => {
-    let translated = opening;
-    for (const attribute of ['title', 'aria-label', 'placeholder', 'alt']) {
-      const key = new RegExp(`data-i18n-${attribute}="([^"]+)"`).exec(opening)?.[1];
-      if (key) translated = translated.replace(new RegExp(`\\b${attribute}="[^"]*"`), `${attribute}="${escapeText(i18n.t(key)).replaceAll('"', '&quot;')}"`);
-    }
-    return translated;
-  });
+  const result = localizeHtml(source, key => i18n.t(key));
   return result.replace(/\sdata-i18n(?:-[\w-]+)?="[^"]*"/g, '');
 }