String untranslateble: contains disallowed HTML

I'm trying to translate the privacy policy warning string

By submitting this form, you accept the <a href="@privacy-policy-url" class="mollom-target">Mollom privacy policy</a>. 

I am unable to do this because when I submit the translation I get the following error message:

The submitted string contains disallowed HTML: Al enviar este formulario, usted acepta las <a href="@privacy-policy-url" class="mollom-target"> política de privacidad Mollom </ a>.

Please fix!