use rich string

schema.py

-from cubicweb.schema import format_constraint
-
 
 class Person(EntityType):
     """a physical person"""
@@ -8,10 +6,8 @@ class Person(EntityType):
     civility  = String(required=True, internationalizable=True,
                        vocabulary=(_('Mr'), _('Ms'), _('Mrs')),
                        default='Mr')
-    
-    description_format = String(meta=True, internationalizable=True, maxsize=50,
-                                default='text/rest', constraints=[format_constraint])
-    description        = String(fulltextindexed=True)
+
+    description        = RichString(fulltextindexed=True)
 
     if 'PhoneNumber' in defined_types: # from addressbook package
         phone         = SubjectRelation('PhoneNumber', composite='subject')