minors updates

app.py

@@ -84,7 +84,11 @@ translations = load_ui_language()
 
 
 def main():
+    if 'interface_language' not in st.session_state:
+        # default language
+        st.session_state.interface_language = 'English'
     
+        
     pages = {
         "Configuration" : [
             st.Page("pages/configuration_ui_lang.py", title="Language selection"),