[Nitro] [PATCH] Improvement to HTML error output

[itsme213]

> If you already were referring to the just the icons, the way I  
> envision them would not be intrusive. If this separate icons patch  
> ever materializes, should you disagree and after seeing how they sit  
> in the template and found their implementation to be intrusive, we  
> would add an option to enable/disable them 

Just CSS might suffice. Though I doubt anyone would want to disable this.