Tacitus's Agricola says, at the end of XXX:
XXX. "... Auferre, trucidare, rapere, falsis nominibus imperium; atque, ubi solitudinem faciunt, pacem appellant."
which is to say
To ravage, to slaughter, to usurp under false titles, they call empire; and where they make a desert, they call it peace.
It might be possible that Martial wrote something ...
I have figured out where they got the quote form. Googling the original quote in Croatian shows that the line
appears in the book Zlatna knjiga svjetske poezije za djecu by Zvonimir Balog, which Google translate says means The Golden Book of World Poetry for Children.
MY ORIGINAL ANSWER, which shows that Jean de la Fontaine never wrote anything ...