Allowed for posting of articles

A visitor to the site can add an article with a required title field and a URL and/or content field. Currently very basic (read: ugly) and can allow the posting of an "article" with only a title and no URL or content.
These error messages are best managed in [I18n](http://guides.rubyonrails.org/i18n.html#error-message-scopes). Let's plan to discuss.