Update app.py

in line 49, the `return` statement will make language code always set as 'a' and return, which is not correct.
I suggest to remove it.

app.py

@@ -46,7 +46,6 @@ def update_pipeline(Language):
         # Revert to default English and return immediately
         pipeline = KPipeline(lang_code="a")
         last_used_language = "a"
-        return  
 
     # Get language code, default to 'a' if not found
     new_lang = language_map.get(Language, "a")