cubicweb #472831 edit form of entities uses the wrong label for relations [resolved]

using the following schema:

class BeanBox(EntityType):
   name = String(required=True, maxsize=255)
   contains = SubjectRelation('Bean', cardinality='*1')

class Bean(EntityType):
   name = String(required=True, maxsize=255)

class LetterBox(EntityType):
   name = String(required=True, maxsize=255)

class Letter(EntityType):
   name = String(required=True, maxsize=255)
   stored_in = SubjectRelation('LetterBox', cardinality='1*')

Creating a Letter will correctly display "stored_in" for the relation, but creating a Bean will display "contains" instead of "contains_object".