change lang selection to radio button

app.py

@@ -68,7 +68,7 @@ def opus_trans(message, target_lang):
 
 
 article = gr.Textbox()
-lang_select = gr.Dropdown(["en", "zh"])
+lang_select = gr.Radio(["en", "zh"])
 translate = gr.Interface(
     opus_trans,
     [