I'm not sure it's quite that simple - they've held the Presidency multiple times in this period but as far as I know they've not performed an action like this. There's certainly something going on, but it's not just a hissy fit. As others have mentioned it's only for the duration of the French presidency, it'll probably get switched to English when the Czech presidency begins.
The next Presidential elections are early next year, that's why. Macron wants to look more important/relevant, and a keeper of french values and cultural importance.
Put that way it doesn't sound much like a typical French thing or a hissy fit, but the sort of thing politicians everywhere do. It's dumb and petty and will probably backfire somehow, but there we go.
