Update app.py

app.py

@@ -48,7 +48,7 @@ def join_wav_files(input_files, output_file):
 def generate_story(text, lang):
     """Generate a story using the langchain library and OpenAI's GPT-3 model."""
     prompt = PromptTemplate(
-        input_variables=["text"],
+        input_variables=["text", "lang"],
         template=""" 
         You are a fun and seasoned storyteller. 
         Generate a short bedtime story for a 5 years old audience about {text}.