anchor.diff:                                  h1
                                       if op.get(echo, 'author', '')
                                           span.artist= op.get(echo, 'author', '')
  -                                    
  -                                    //- if op.get(echo, 'producer', '')    
  -                                    //-     span.producer= op.get(echo, 'producer', '')
  -                                    //- 
  -                                    //- if op.get(echo, 'town', '')    
  -                                    //-     span.town= op.get(echo, 'town', '')
  -                                        
  +
                                   h1= op.get(echo, lang + '-title', '')
  -                                
  +
                                   if op.get(echo, lang + '-subtitle', '')
                                       p= op.get(echo, lang + '-subtitle', '')
   
  
positive.code:                         .col-lg-12
                              h2= op.get(echo, [lang + '-title'])
                              p.subtitle= op.get(echo, [lang + '-subtitle'])
                              p.article= op.get(echo, [lang + '-contents'])
                  
  
negative.code:                                 var gradientMap = '#{SAAL.secondary_color}, #{SAAL.main_color}';
  
                                  GradientMaps.applyGradientMap(slide#{id}, gradientMap); 
  
          .row.page-margin
  
              .col-md-12
                  .programme.row
  