Need year correction in date_format with locale

[jbfagotfede39]

When using labels = date_format with locale settings, year is not showed.

Here's my minimal script :

date_range <- function(start, days) {
  start <- as.POSIXct(start)
  c(start, start + days * 24 * 60 * 60)
}
one_year <- date_range("2020-05-01", 365)
demo_datetime(one_year, labels = date_format("%b %Y", locale = "fr"))
demo_datetime(one_year, labels = date_format("%b %Y"))

Thank you for your patch