Using gr.Dropdown()

app.py

@@ -113,13 +113,13 @@ with gr.Blocks() as demo:
 
     # Source and target languages
     with gr.Row():
-        src_lang = gr.Radio(
+        src_lang = gr.Dropdown(
             choices=model_translation.language_codes.items(),
             value="auto",
             label="Source language",
             render=True
         )
-        tgt_lang = gr.Radio(
+        tgt_lang = gr.Dropdown(
             choices=model_translation.tgt_language_codes.items(),
             value="en",
             label="Target language",