You do have a good point about checking their work. This is not the first nor will it be the last add on that has the English translations fowled. Most of the developers in the past, have made corrections once the errors have been identified. They are from Spain so e-mail them at
soporte@wwiies.com . I have purchased a lot of pay for add ons. Most were in German. So if the errors are in Spanish. I can at least muddle my way through it.