sulu-cmf/sulu-standard#125 Copy locale ui

__Tasks:__

- [x] test coverage
- [ ] gather feedback for my changes

__Informations:__

| Q             | A
| ------------- | ---
| Tests pass?   | yes
| Fixed tickets | sulu-cmf/sulu-standard#125
| BC Breaks     | none
| Doc           | none
but i dont need the content of the model as body so the backbone model is not a good solution ... or i need to pass the sandbox so that i can call the `util.save` method! otherwise i cannot POST without the data with the backbone model!