Translating Ren'Py games: A guide, by moskys This is a guide.
The involved tools are listed in its first page. You also need prepare a font for your language beforehand. (Or you can find me in this game's steam community guide for collaboration. Technically, it's a makeshift localization, I just grasp some basic concepts of the translation process.)
Overall, in my opinion, this game is easy enough to translate for a beginner!