While I can be as partisan as the next guy, this is just ridiculous.
If they want more tweets in French, then they should hire a staffer or two to write them for him. It's not realistic to expect that someone who isn't fluent in French is going to tweet in it.
I can speak some German, Japanese and Chinese, but I never tweet in anything but English.
On the ironic/funny side, his two most recent tweets were in French!
https://twitter.com/HonJohnBaird