Spanish translation

Thank you for your work, but changing strings inside php code is not the proper way to provide translations for modules.
Drupal uses a more advanced translation (internationalization/localization) system.
You'll find pointers about it at
http://drupal.org/contribute/translations
http://drupal.org/node/11396
http://drupal.org/node/314231

in short: you should take the file captcha-module.pot in the translations subdirectory of the CAPTCHA module, save it as es.po and translate the strings in that file.
You can see an example translation to Dutch at http://cvs.drupal.org/viewvc.py/drupal/contributions/modules/captcha/tra...

I am not able to translate "This question is for testing whether you are a human visitor and to prevent automated spam submissions." even using the translation module... weird.. translating the other strings was straightforward...

what do you mean with

I am not able to translate

?

You translated it in your es.po file, but it does not show up on a CAPTCHA instance?
This is expected, as the string that is showed on a CAPTCHA instance does not directly come from the es.po translations, but from a setting on the general CAPTCHA administration page (CAPTCHA description for Spanish). Now, the value of this setting comes from es.po only the first time you visit (submit actually) the CAPTCHA administration page. Once you've submitted that form, it does not look it up in es.po anymore. This weird behavior is addressed in (part of) #476288: Showing CAPTCHA description: control by an explicit checkbox instead of by unobvious string emptiness .

But in your case you can fix it by putting the translated string in the Spanish CAPTCHA description text field on the general CAPTCHA administration page.

Yeah, I was using the translate interface option... anyway the description text field on the general CAPTCHA administration page did the trick.

Thanks.