Add a back button on every error page

Hello,

On error pages (ie. when one forgets to write a comment before sending it), below the error message is a back button. That’s good.
However on some error pages, there is no back button. One then needs to go back through the browser back button, which is not as friendly.
Exemples:
– After entering a wrong value
– When captcha time has expired

Would you please check all error messages and make sure they all display a back button? That’d be great :-)

Thanks for your attention,
Fran