Update app.py

app.py

@@ -481,7 +481,7 @@ with gr.Blocks(title="Cours de Droit", css=CSS) as demo:
         audio_out  = gr.Audio(label="Cours audio (français)", autoplay=False, interactive=False)
         timer_info = gr.Markdown("")
         with gr.Row():
-            start_btn = gr.Button("▶️ Démarrer l'écoute"+_LLAMA_OK, variant="primary")
+            start_btn = gr.Button("▶️ Démarrer l'écoute"+str(_LLAMA_OK), variant="primary")
             check_btn = gr.Button("🔄 Vérifier le temps",  variant="secondary")
             quiz_btn  = gr.Button("✅ Accéder au Quiz",    variant="secondary", interactive=False)