Mistranslations don't change a lute into a fiddle. These are different instruments. They look different, and they sound different. And they are played COMPLETELY differently. I will NOT back down on this. It was a lute.
Also, medieval writers in what cultures? Because I'm pretty sure the ones from Italy did distinguish between the lute and the fiddle. They might've called it the same word in some cases, like you might call a glass a glass or a cup a glass or a mug a glass, and it's still a technically correct name, they are different. And glass mugs do exist, I have one right now on my desk in front of me.
You can't be right just because you give the source of where you got your misinformation from. Sorry. I don't think that's how it works.
No offense, though. Everyone makes mistakes. As far as I know, I could be making one right now and not even know.