[demo] fix 4B tag

app.py

@@ -168,7 +168,7 @@ def save_feedback(transcription, rating, language, audio_path=None):
     with open(feedback_file, "w", encoding="utf-8") as f:
         json.dump(feedback_data, f, ensure_ascii=False, indent=2)
     
-    return "Thank you for your feedback!"
+    return "🪂 Thank you for your feedback!"
 
 # Create the Gradio interface with tabs
 demo = gr.Blocks(title="NVIDIA Research Multilingual Demo")