Language locale not changing when dropdown-years selected

[matteotrab]

Thanks for taking the time for writing this bug report.

Code

import { fr } from "react-day-picker/locale";

<DayPicker
  captionLayout="dropdown-years"
  mode="single"
  locale=fr

/>

import { DayPicker } from "react-day-picker";

export function Start() {
  return (
    <DayPicker  />
  );
}

Expected Behavior

The name of the months in the nav bar should be in French.

Actual Behavior

The name of the months are in English.