Update app.py

app.py

@@ -49,14 +49,14 @@ def download_argos_model(from_code, to_code):
     argostranslate.package.install_from_path(package_to_install.download())
 
 def argos(sl, tl, input_text):
-    import argostranslate.translate       
+    import argostranslate.translate, argostranslate.package       
     # Translate
     try:
         download_argos_model(sl, tl)
         translated_text = argostranslate.translate.translate(input_text, sl, tl)
     except StopIteration:
-        all_argos_combos = ', '.join(argostranslate.package.get_available_packages())
-        translated_text = f"No Argos model for {sl} to {tl}. Try other model or languages combination! Available Argos models: {all_argos_combos}."
+        available_packages = ', '.join(argostranslate.package.get_available_packages())
+        translated_text = f"No Argos model for {sl} to {tl}. Try other model or languages combination! Available Argos models: {available_packages}."
     except Exception as error:
         translated_text = error
     return translated_text