Set default language if all language pills are disabled

app.py

@@ -21,7 +21,9 @@ def load_class_model(name):
     model = class_models.get_model(name)
     return model
 
-lang = st.pills(label=langs_str, options=langs, default=en)
+lang = st.pills(label=langs_str, options=langs)
+if lang is None:
+    lang = en
 st.title(page_title[lang])
 model_name = st.selectbox(
     model_label[lang], options=class_models.get_model_names_by_lang(lang)