structure:
 row1:
  col1: 
    head: "Premier utilisateur"
    size: 3
    bloc:
      - username,required                          		#1    Identifiant
      - password,required                          		#2    Mot de passe
      - verifPassword,required                     		#5    Confirmation du mot de passe
      - submit,Valider,class={btn-primary}         		#3    Valider