i18n: new crowdin translations (#2433)

Co-authored-by: Create or Update Pull Request Action <create-or-update-pull-request@users.noreply.github.com>
Co-authored-by: Sebastian Beltran <bjohansebas@gmail.com>

Author: 3 people

.github/workflows/update-external-docs.yml

@@ -132,5 +132,5 @@ jobs:
           title: 'i18n: new crowdin translations'
           body: >
             New Crowdin translations from the [express.js crowdin project](https://express.crowdin.com/u/projects/1). cc: @expressjs/docs-wg
-          labels: docs
+          labels: i18n
           branch: crowdin/translations

src/content/docs/de/4x/advanced/developing-template-engines.md

@@ -25,6 +25,31 @@ app.set('views', './views'); // specify the views directory
 app.set('view engine', 'ntl'); // register the template engine
 ```
 
+```ts
+import fs from 'fs'; // this engine requires the fs module
+app.engine(
+  'ntl',
+  (
+    filePath: string,
+    options: Record<string, any>,
+    callback: (e: any, rendered?: string) => void
+  ) => {
+    // define the template engine
+    fs.readFile(filePath, (err, content) => {
+      if (err) return callback(err);
+      // this is an extremely simple template engine
+      const rendered = content
+        .toString()
+        .replace('#title#', `<title>${options.title}</title>`)
+        .replace('#message#', `<h1>${options.message}</h1>`);
+      return callback(null, rendered);
+    });
+  }
+);
+app.set('views', './views'); // specify the views directory
+app.set('view engine', 'ntl'); // register the template engine
+```
+
 Your app will now be able to render `.ntl` files. Create a file named `index.ntl` in the `views` directory with the following content.
 
 ```pug

…/advanced/developing-template-engines.md …advanced/developing-template-engines.mdxsrc/content/docs/ko/4x/advanced/developing-template-engines.md renamed to src/content/docs/de/4x/advanced/developing-template-engines.mdx src/content/docs/ko/4x/advanced/developing-template-engines.md renamed to src/content/docs/de/4x/advanced/developing-template-engines.mdx

@@ -77,6 +77,14 @@ app.set('trust proxy', (ip) => {
 });
 ```
 
+```ts
+app.set('trust proxy', (ip: string) => {
+  if (ip === '127.0.0.1' || ip === '123.123.123.123')
+    return true; // trusted IPs
+  else return false;
+});
+```
+
 </td>
     </tr>
   </tbody>
@@ -91,8 +99,8 @@ Das Aktivieren von `trust proxy` hat folgende Auswirkungen:
   </li>
   <li markdown="1">
     `X-Forwarded-Proto` kann vom Reverse Proxy gesetzt werden, um der App mitzuteilen, ob es `https`
-    oder `http` oder sogar ein ungültiger Name ist. Dieser Wert wird von [req.protocol]reflektiert
-    (/en/api#req.protocol).
+    oder `http` oder sogar ein ungültiger Name ist. This value is reflected by
+    [req.protocol](/api/request/#reqprotocol).
   </li>
   <li markdown="1">
     Die Werte [req.ip](/api#req.ip) und [req.ips](/api#req.ips) werden auf der Basis der