What are effective CAPTCHA solutions that can have localized description, and CAPTCHA text itself is either language-neutral, or can be localized (for Polish language)? It is to be used to protect a kind of contact form.
reCAPTCHA (for example) allows i18n of the widget, but this still uses English source text that is then machine-translated. This makes it, I think, harder to solve for people who do not know English at all. I suspect it is even worse for the audio version of CAPTCHA.