You need to write it in your Localization.txt
As example, If you wrote long_desc_key as ChocolateLovesMe and desc_base as ChocolateHatesMe, then you need to do:
Key,English,French
ChocolateLovesMe,,"Débloque leurs fabrication."
ChocolateHatesMe,,"Établi et Creuset."
if you wanna use comma in descriptions, then you need to close all text in " "