Fixed country specific decimal separators in the traits documentation

I updated https://github.com/OpenRA/OpenRA/wiki/Traits from my de_DE machine manually as we currently don't have automatiation https://github.com/OpenRA/OpenRA/issues/5900 and noticed the inconsistency. @x-a-n-a-x notified me of this issue few days ago and I did not believe him at first. https://github.com/OpenRA/OpenRA/wiki/Traits#harvester FullyLoadedSpeed is a good example of this problem.