Hi! Here is a copy paste from the instructions within the game, with these I was able to change them. Hope it helps!
There are two sprites in the game that include text: the title screen and a poster in the collector’s timeline. Participant can choose to provide a translated version of these images as follows by replacing them inside the game.zip archive, which contains the assets used by the game.
The files to be replaced are assets/single_sprites/poster_translated.png and assets/single_sprites/title_translated.png. There is also the English version of these images in the same folder, which should non be changed.