I think this makes a good demo in that it gives you a feel for the story and an ending, although the ending leaves enough up in the air that it makes you wonder what is _really_ going on. I've only played through Laurent's route so far, but I wanted to suggest that if the MC is supposed to understand the part in French, then there should be subtitles. The MC seems to understand, based on the comments after, but my somewhat crappy French left me a little confused about the whole thing. Anyway, thank you so much for finishing this for us. I look forward to what comes next.
The demo's ending isn't really the full game's ending, as the full project stretches beyond the plot, but I am glad that the demo gives a feel of completion regardless! :D
Since it's really up to the player if MC can speak/understand other languages or not, I didn't want to add subtitles on-screen. That said, as in the other two routes the translation can be found in the codex section of the game (that little notebook icon in the upper left corner of the screen). It unlocks after a notification "Codex: Glossary" pops up on the screen. I hope that's a satisfactory compromise!