Stieve, how we can help you for localizations game interface and ingame texts ?
As i know, C# and Visual Studio have some instruments for it.
https://docs.microsoft.com/en-us/dotnet/standard/globalization-localization/
If it is quick I don't mind, but I won't be spending any significant time on adding functions I won't use personally (or learning how to do that), especially if there are options available in Windows settings. This is a hobby, so I am not aiming for the widest possible user base.
The best help would be a quick explanation of how to do what you need me to do