This has been incredibly frustrating for me. I get this spam a lot and it isn't flagged by Google Analytics as spam since it keeps showing up when I have block spam turned on. The biggest reason why it bothers me is that I have a fairly new site and I'm trying to get people to download my trial (or even buy) but when there is all this spam it makes it seem like I'm getting a lot of traffic but no conversions.
I've had two clients tell me that their Google Analytics is getting this spam. Super annoying.
I guess they just send the spam by faking window.navigator.languages or something?