Of course, good code is 99% due to the person producing it and only 1% (if that) due to the language used
I agree that it's at least a majority of the person producing it, but I wouldn't say 99%. Good language design, in the right and appropriate circumstances, do indeed help. For example, Java (which you mention as bad) actually makes it MUCH harder for software to crash. For example, I lead a mobile team with Objective C (iOS) and Java (Android). The number of users experiencing crashes on the iOS app is around 2.5%, while the Android app is a perfect 0%. I don't think the Android devs are any better than the iOS devs - I am certain it's the language.
For the record, I have nothing good to say about C++