Hello! When I edit and save book "like html", I paste in some tags like - <dfn> or an attribute spellcheck for some tags, and they don't save. I paste : <dfn>Spellcheck</dfn> - Spellcheck does not impact validation. after I save the book, it's look like : Spellcheck - Spellcheck does not impact validation. Where I can edit settings to resolve that problem ? Thanks !