This is part of a poem by French ultra nationalist and anti-semite Paul Déroulède:
Et la revanche doit venir, lente peut-être, Mais en tout cas fatale, et terrible à coup sûr; La haine est déja née, et la force va naître : C'est au faucheur a voir si le champs n'est pas mûr
Roughly translated by non-poet and a poor French speaker (moi):
Vengeance shall come, slowly perhaps, but terrible and complete. Hatred’s born already, and soon the force shall be. Be they ready or not, we’ll mow them down.
Oh, what a fabulous slogan for the Donald Trumps of the world, and our own dear murder-minded Michele Fiore? The hatred is born, indeed.