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I have added the "btn" class so that the save button is styled.
![grafik](https://user-images.githubusercontent.com/6266037/33505723-d061ea68-d6ec-11e7-9711-47db57b90b9c.png)
![grafik](https://user-images.githubusercontent.com/6266037/33505686-b305dc4a-d6ec-11e7-815f-4a41eb8147f8.png)
In addition I have updated codemirror and all other dependencies as they were quite old.