Prevent duplicate submit buttons by hiding the original actions form element.

#5363 
I fix the widget of the slide show:
![selection_007](https://f.cloud.github.com/assets/1222368/2367529/8386a12a-a766-11e3-8c2c-678a1c72083d.png)
![selection_006](https://f.cloud.github.com/assets/1222368/2367528/83849f88-a766-11e3-9b39-873baeec2017.png)
And also fix the form of the node creation:
![selection_009](https://f.cloud.github.com/assets/1222368/2367531/9184bdde-a766-11e3-8ca7-840c9c6884c3.png)
![selection_008](https://f.cloud.github.com/assets/1222368/2367530/9182a79c-a766-11e3-8da7-f3c6200cf449.png)