Localization

Hi,

How do I localize the messages the user sees when submitting a form? Eg:

Thank you for contacting us!
Incorrect email address!

I’m using CodeStyling plugin for localization, but Contact Form with Captcha does not appear listed. No PO file?

Thanks!

http://ww.wp.xz.cn/extend/plugins/contact-form-with-captcha/