Oh dear... ok I will be looking into that now! Cheers!!

Good luck with your new project !

I know about the loss of data for the new definitive edition, I completely understand the technical reasons. I'm saying here that I lost all data again after your AZERTY update, today after the game got updated with your recent changes.

I posted a warning in January about the imminent loss of save data. Best I could do, honestly. Given the new word mastery system I've implemented it was not going to work properly with the old save files. As for testing, I am an indie developer and do everything myself on shoestring budget with no publisher. I'll look into TDD but I'm about to take a long break from Influent to finish porting my arcade game project, Armed and Gelatinous to Steam, Xbox, and PlayStation. With regard to the translations, it appears I got scammed and that's a bummer. I'll definitely refrain from using their services in the future.

And for the translation, I know that it may be more expensive with a professional translator, but here, and I don't mean to rub salt into the wound, you paid for a level of quality you could have gotten for free by passing all your dialog through Google translate. At least that's my opinion, you'll see what your french friend tells you. Hell, I could have done it for you for the same per word rate as Gengo and with, if I dare say so myself, better quality, as I used to be a translation tester for Paradox a little while back, and they have TONS of text to translate there.

Do you use any automated tests for your code ? Unit testing ? Do you have any CI pipelines in place ? If not, you should maybe look into TDD (Test Driven Development). It would assure you that you don't break any feature or bring any regression with a new update before you push it on your production branch. If you use GitHub, you can easily implement that with Actions, automation scripts written in YAML. Bitbucket also has pipelines, but to my knowledge it's more annoying to implement.
I don't code that much in C# anymore, but I think there is dotnet test xUnit for that in Visual Studio.