For the consistency order in the privileges control should be Grantee, Privileges and Granter.
Fixed.
Correct the SQL from "DROP Foreign Data Wrapper" to "DROP FOREIGN DATA WRAPPER" in sql pane.
Fixed.
For Owner control there should a validation like "Owner can't be empty" when user tries to modify owner for Foreign data wrapper, Foreign Servers.
Fixed.
Correct the SQL from "DROP Foreign Server" to "DROP SERVER" in sql pane when click on any Foreign Server node.
Fixed.
When click on database node it should show menu for "Create-> Foreign Data Wrapper", when click on any Foreign data wrapper node it should show menu for "Create-> Foreign Data Wrapper" and "Create-> Foreign Server", when click on any Foreign Server node it should show menu for "Create-> Foreign Server" and "Create-> User Mapping".
Fixed.
Correct the SQL from "DROP User Mapping enterprisedb" to "DROP USER MAPPING FOR enterprisedb SERVER fs1" in sql pane when click on any User Mapping node.
Fixed.
On postgresql 9.1 and 9.2 Foreign Data wrapper node failed with below error when clicked on properties or sql tab. function expression in FROM cannot refer to other relations of same query level LINE 15: aclexplode(fdwacl) d ^
Fixed.
Apart from the above please fixed warning as much as possible using pep8 tool.