Adding Langchain QA

app.py

@@ -118,7 +118,7 @@ with gr.Blocks(css=css) as demo:
         with gr.Column():
             with gr.Box():
                 LLM_option = gr.Dropdown(['HuggingFace','OpenAI'],label='Large Language Model Selection',info='LLM Service')
-                API_key = gr.Textbox(label="Add {} API key".format(LLM_option), type="password")
+                API_key = gr.Textbox(label="Add API key".format(LLM_option), type="password")
             with gr.Column():
                 with gr.Row():
                     file_extension = gr.Dropdown(FILE_EXT, label="File Extensions", info="Select your files extensions!")