Links in error lists looks bad [PATCH]
By passing a SafeString to the ValidationError, you can include markup in your error messages. This quite useful, escpecially to put links to more detailed explanations in the error message. But even though the error messages are styled white on red background, the links are rendered just in their default color (blue), which looks really bad and is nearly unreadable on red background. I have added a patch, that styles those links white with an underscrore, to make them recognized as link by the user.