Update app.py

app.py

@@ -17,6 +17,9 @@ from langchain_core.runnables import RunnableConfig
 if 'language' not in st.session_state:
     st.session_state.language = detect_browser_language()
 
+    if not st.session_state.language:
+        st.session_state.language = "en-US"
+
 if 'read_file' not in st.session_state:
     st.session_state.read_file = False
     st.session_state.retriever = None