Move right submit button in mobile new action

So that the new form looks like this:

![development _-_2014-12-15_23 23 16](https://cloud.githubusercontent.com/assets/65402/5446030/5e50a760-84b1-11e4-8be0-f080d263b1dd.png)

I think it improves a bit the usability of the form making it more difficult to click back when trying to submit the form (happened to me :( ).

In the future I would like to spend some time making the mobile interface a bit more finger friendly, even just by making targets a bit bigger (http://msdn.microsoft.com/en-us/library/windows/apps/hh465415.aspx#touch_targets). What do you think, is something of any interest? I use a lot the mobile interface of Tracks.