Translate pages, areas, menus, forms and posts field by field instead of rebuilding them

A site can have further languages (Settings → Languages). A page is built once; each language
adds only its texts, keyed by the stable block IDs, plus its own address under /en/… (ADR 111,
document schema v27, migration 20261009000100 for page_translation).

- Editor: DE | EN switch, a list of all texts with original, state (missing, translated,
  original changed) and filter; structure stays with the main language. Undo, drafts,
  publishing and revisions cover all languages at once.
- Website: /en and translated slugs, lang, canonical, hreflang with x-default, og:locale,
  sitemap; links to translated pages follow the language; a language switch block.
- Header, footer and linked sections translate the same way; menu entries carry labels per
  language; fixed template texts come from a small dictionary.
- Forms: labels, help, options, button and success message per language; messages and the
  step script speak the language, the submission and the email stay in the main language.
- Posts, archives, category names, consent text and the 404 page follow the language.
- Single-language sites see none of it and never touch the new table.

The forms administration becomes an overview with one row per form and its own edit page;
fields are one line each with details collapsed.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

scripts/admin-quality-check.mjs

@@ -46,6 +46,7 @@ try {
     await page.getByLabel('Benutzername').fill(fixture.username); await page.getByLabel('Passwort', { exact: true }).fill(fixture.password);
     await page.getByRole('button', { name: 'Anmelden', exact: true }).click();
     await page.waitForURL(origin + '/admin'); await page.goto(origin + '/admin/forms');
+    await page.locator('.form-list a').first().click(); await page.locator('.form-def').waitFor();
     await page.setViewportSize({ width: 390, height: 844 });
     await page.locator('.field-card').first().screenshot({ path: 'reports/admin-quality/form-field-mobile.png' });
     console.log('Public no-JavaScript baseline and visual captures passed.');
@@ -165,11 +166,18 @@ try {
   checks.push({ name: 'menu search by keyboard, add/nest/remove/undo/save, invalid URL and conflict retain input', passed: true });
 
   await page.goto(origin + '/admin/forms');
+  await page.locator('.form-list a').first().click();
   const form = page.locator('.form-def').first(), message = form.locator('[name="success"]');
+  // Der Abschnitt „Zustellung“ ist zugeklappt, bis man ihn öffnet.
+  const openDelivery = async () => {
+    await form.locator('details.form-section').first().evaluate(section => { section.open = true; });
+  };
+  await openDelivery();
   const widths = await form.evaluate(form => ({ message: form.querySelector('[name="success"]').clientWidth, fields: form.querySelector('.fields').clientWidth }));
   assert.ok(widths.message >= widths.fields - 5, 'success message uses available form width');
   await message.fill('Vielen Dank für deine Nachricht.\nWir melden uns persönlich bei dir.');
   await form.getByRole('button', { name: 'Formular speichern', exact: true }).click();
+  await page.waitForLoadState('load'); await openDelivery();
   assert.equal(await message.inputValue(), 'Vielen Dank für deine Nachricht.\nWir melden uns persönlich bei dir.');
   checks.push({ name: 'wide multiline form response persists', passed: true });