French Revolutionary calendar widget.

Resizable widget which displays the current date and time in the French
Revolutionary calendar. The widget supports the following preferences:

* Whether to display the current time, or the name of the object for that day of the year (ex: grape).
* Calculation method: method used to determine the first day of the year: Either based on the autumn equinox, or the Romme method.
* Language of the calendar (limited to just a few languages for now).

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