#include <iostream>

using namespace std;
class my_fr : public std::numpunct< char > {
protected:
    std::string do_truename() const { return "vrai";  }
    std::string do_falsename() const { return "faux"; }
};

int main() {
    std::cout.imbue(std::locale(std::locale(), new my_fr));
    std::cout << std::boolalpha;

    return 0;
}