capitalized first letter on the donut chart legend

app.py

@@ -155,7 +155,7 @@ def donut_chart_total() -> alt.Chart:
 
     # Load your data
     annotated_records = [annotation for annotation in annotations.values()]
-    languages = [language for language in annotations.keys()]
+    languages = [language.capitalize() for language in annotations.keys()]
 
     # Prepare data for the donut chart
     source = pd.DataFrame(