if(Ext.form.DateField){
   Ext.apply(Ext.form.DateField.prototype, {
      disabledDaysText  : "ÁðåíåñãïðïéçìÝíï",
      disabledDatesText : "ÁðåíåñãïðïéçìÝíï",
      minText           : "Ç çìåñïìçíßá ó' áõôü ôï ðåäßï ðñÝðåé íá åßíáé ìåôÜ áðü {0}",