fix error message

app.py

@@ -10,8 +10,15 @@ def respond(english_text):
     payload  = {
         "inputs": english_text,
     }
-    darija_translated_text = requests.post(API_URL, headers=headers, json=payload)
-    return darija_translated_text.json()[0]["generated_text"]
+    response = requests.post(API_URL, headers=headers, json=payload)
+    
+    try: 
+        output = response[0]['generated_text']
+        
+    except KeyError:
+        output = f"Model is loading. Estimated time {output['estimated_time']}"
+        
+    return output
 
 app = gr.Interface(fn=respond, inputs="text", outputs="text", title="Terjman-Large 👨‍💻🥰", description="Translate English text to Moroccan Darija using our Large model (240M) 🤗")