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Changed Template for splitscreen feature / add rdfa tags:
Merge after this: https://github.com/sulu-cmf/SuluContentBundle/pull/21

- [x] test coverage
- [x] finish the code
- [ ] gather feedback for my changes
- [ ] submit changes to the documentation


| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | yes
| Tests pass?   | none
| Fixed tickets | none
| Doc           | url to doc