Update app.py

app.py

@@ -272,7 +272,7 @@ def get_translation_model(source_language, target_language):
     - str: The translation model identifier.
     """
     # List of allowable languages
-    allowable_languages = ["en", "es", "fr", "zh", "de", "it", "pt", "ja", "ko", "ru"]
+    allowable_languages = ["en", "es", "fr", "zh", "de", "it", "pt", "ja", "ko", "ru", "hi"]
 
     # Validate source and target languages
     if source_language not in allowable_languages: