Update app.py

app.py

@@ -35,3 +35,4 @@ if lang is not None:
   st.write(f"langcodes found the following tag: {lang}")
   st.write(f"Display name for {lang}: {lang.display_name()}")
   st.write(f"Autonym for {lang}: {lang.autonym()}")
+  st.write(f"Alpha3 version (deprecated): {lang.to_alpha3()}")