anchor.diff:  
                 .header_title
                   a(href="/") Arguments
  -              
  -              if current_user.is_authenticated()
  +
  +              if current_user.is_authenticated
                   .header_menu
                     .username= current_user.display_name
                       .up_arrow
  
positive.code:         a(href="/")
            .footer_logo
          #footer_copyright
            a(href="#") FAQ 
            || 
            a(href="#")= _("terms_of_use")
            || 
            a(href="#")= _("link_other")
            || 
            a(href="#")= _("imprint")
  
  
  
negative.code:             .header_navigation
  
                .navi_point.title(class=("current_page" if not mode or mode=="sorted" else ""))
                  a(href=url_for("questions", tag=tag|default(None)))= _("sorted")
  
                .navi_point.top(class=("current_page" if mode=="top" else ""))
                  a(href=url_for("questions", mode="top", tag=tag|default(None)))= _("top")
  
                .navi_point.overview(class=("current_page" if mode=="custom" else ""))
                  a(href=url_for("questions", mode="custom"))= Antragsgruppen
  