Update app.py

app.py

@@ -20,7 +20,10 @@ st.session_state["tselected_language"] = tselected_language
 st.session_state["model_name"] = model_name
 
 if model_name == 'Helsinki-NLP':
-    model_name = f"Helsinki-NLP/opus-mt-{sl}-{tl}"
+    try:
+        model_name = f"Helsinki-NLP/opus-mt-{sl}-{tl}"
+    except EnvironmentError:
+        model_name = f"Helsinki-NLP/opus-tatoeba-{sl}-{tl}"
     tokenizer = AutoTokenizer.from_pretrained(model_name)
     model = AutoModelForSeq2SeqLM.from_pretrained(model_name)
 else: