To add this additional formula, you will first need to create a Localization Key formula property.

1. Click the ellipsis icon ••• to the left of the blue New button, then select Properties.
2. Click the New Property button below the list of existing properties.
3. Select the Formula option and name it Localization Key. It must be named exactly this so the new Next Due formula correctly references it.
4. Click the Formula option in the Edit property panel to open the editor, then paste the following into it.

[
/* Rewrite these weekday and recur unit options in your own language, so your second brain can work even better with your first. Make sure to set up the same options in the "Recur Unit" and "Days (Only If Set to 1 Day(s))" properties afterward, so you can select them. Feel free to remove the original names afterward! */

/* ["Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday"] */
["lunes", "3ª", "mercredi", "木曜日", "piątek", "lørdag", "Double Sunday"],

/* ["Day(s)", "Week(s)", "Month(s)", "Year(s)", "Month(s) on the Last Day", "Month(s) on the First Weekday", "Month(s) on the Last Weekday"] */
["Day(s)", "Week(s)", "Month(s)", "Year(s)", "Month(s) on the Last Day", "Month(s) on the First Weekday", "Month(s) on the Last Weekday"]
]