BetterTouchTool is using oneskyapp.com for all translation activity.
If you encounter a bad translation, typo, or something like that, you can either report it here in the forum, or directly go to BetterTouchTool Translation Center search for the phrase and fix it yourself.
Also if you want to help with translating (I wouldn't recommend that, it's a lot of annoying work) you can also do that via BetterTouchTool Translation Center.