diff --git a/bot.py b/bot.py
index a78f7f0..4b143ad 100644
--- a/bot.py
+++ b/bot.py
@@ -474,7 +474,7 @@ class Bot:
                         parts = []
                         for e in doc_entries:
                             label = {"pdf": "PDF", "image": "Bild", "text": "Datei"}.get(e["type"], "Dokument")
-                            text = e["text"][:10000] if e["type"] != "image" else e["text"][:2000]
+                            text = e["text"][:40000] if e["type"] != "image" else e["text"][:2000]
                             parts.append(f"[{label}: {e['filename']}]\n{text}")
                         document_context = "\n\n".join(parts)
                         logger.info("Passing %d document context(s) to voice session (%d chars total)",
@@ -786,6 +786,7 @@ class Bot:
             logger.info("Translation check: detected=%s, preferred=%s, len=%d", detected_lang, preferred_lang, len(body))
             if (
                 detected_lang != "Unknown"
+                and len(detected_lang) < 30  # sanity check: language name, not a sentence
                 and detected_lang.lower() != preferred_lang.lower()
                 and len(body) > 10  # skip very short messages
             ):
diff --git a/voice.py b/voice.py
index d6db7df..3bc382f 100644
--- a/voice.py
+++ b/voice.py
@@ -700,7 +700,7 @@ class VoiceSession:
 
             instructions = _build_voice_prompt(model=self.model, timezone=user_timezone) + memory_section
             if self._document_context:
-                instructions += f"\n\nDokument-Kontext (PDF im Raum hochgeladen):\n{self._document_context}"
+                instructions += f"\n\nDokument-Kontext (im Raum hochgeladen):\n{self._document_context}"
             agent = _NoiseFilterAgent(
                 instructions=instructions,
                 tools=[search_web, set_user_timezone],