added validation for Profile

Signed-off-by: Alex Izotov <martinandrudy@gmail.com>
fixed validation for Article

Signed-off-by: Alex Izotov <martinandrudy@gmail.com>
added validation for Category

Signed-off-by: Alex Izotov <martinandrudy@gmail.com>
fixed validations for User

Signed-off-by: Alex Izotov <martinandrudy@gmail.com>