Translation errors

There where some rather serious translation errors. 

What especially astonished me:
"To strain a cocktail" is a certain cocktail mixing technique that translates to "einen Cocktail abseihen" (Google it). Don't know how this became to "Gewissenhaft" = Careful, conscientious. And then "thoroughly" (gut, tüchtig, ordentlich, gründlich) was also translated into "Gewissenhaft", which I'd say is rather the oposite of thorough ;)