Calendar: Locale not applied for day of the week (%A)

[LelouBil]

I have the following calendar/clock configuration

"clock#time": {
    "format": "<span rise='1000'>󰥔</span> {:%H:%M}",
    "locale": "fr_FR.UTF-8",
  },
  "clock#date": {
    "format": "<span rise='1000'>\uDB80\uDCED</span> {:%A %d/%m}",
    "locale": "fr_FR.UTF-8",
    "tooltip-format": "<span font_family='VCR OSD Mono' line_height='2'>{calendar}</span>",
    "calendar": {
      "mode": "month",
      "format": {
        "months": "<span>{}</span>",
        "weekdays": "<span color='#FF0024ff'>{}</span>",
        "today": "<span color='#17DCF5'><b><u>{}</u></b></span>"
      }
    }

The clock is correctly 24H, and the tooltip is also correctly showing french abbreviations for day names.

However, in the bar itself, it is written "Thursday 13/02" instead of "Jeudi 13/02"