🌐 Add German translation for `docs/de/docs/reference/apirouter.md` (#10819)

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+# `APIRouter`-Klasse
+
+Hier sind die Referenzinformationen für die Klasse `APIRouter` mit all ihren Parametern, Attributen und Methoden.
+
+Sie können die `APIRouter`-Klasse direkt von `fastapi` importieren:
+
+```python
+from fastapi import APIRouter
+```
+
+::: fastapi.APIRouter
+    options:
+        members:
+            - websocket
+            - include_router
+            - get
+            - put
+            - post
+            - delete
+            - options
+            - head
+            - patch
+            - trace
+            - on_event