Pluralization seems broken

If I have a model named `Delivery` and feed it into CRUD Builder Django correctly assembles the url as:

`/crud/models/deliveries/`

But everything in CRUD Builder itself says:

`Deliverys` 

Same for `Box` -> `Boxs` and so on and so forth. 

If Django can get it right, why isn't this library using the same names? 

