Copy language command

__Tasks:__

- [x] test coverage
- [ ] gather feedback for my changes

__Informations:__

| Q             | A
| ------------- | ---
| Tests pass?   | yes
| Fixed tickets | part of https://github.com/sulu-cmf/sulu-standard/issues/125
| BC Breaks     | none
| Doc           | none
Yes. imo its better than passing all of these variables to every function in the class in a Command context.