Change the text’s language for Calendar, message, days, and months text to your preferred language.
Go to Text/Language Settings in Settings menu.
This settings allows to add delivery date & time texts with your own language.
You will see there to add your own custom labels for Calendar and Timer Text, Message Text for Validation for date and time, Calendar Note, Checkout and Thank you page, Calendar Days and Month.
You can add text here in your own language for given labels.