diff --git a/app/api/ws.py b/app/api/ws.py
index b5c85c7..a9a43e7 100644
--- a/app/api/ws.py
+++ b/app/api/ws.py
@@ -209,7 +209,10 @@ async def _voice_turn(websocket, store, user, session_id, audio, fmt, options):
         return
     await websocket.send_json({"type": "transcript", "text": transcript})
     if not transcript or not transcript.strip():
-        await websocket.send_json({"type": "error", "detail": "empty transcript"})
+        await websocket.send_json({
+            "type": "error",
+            "detail": "Keine Sprache erkannt — bitte erneut sprechen.",
+        })
         return
     await _run_turn(websocket, store, user, session_id, route, orchestrator, output, transcript, options)