1346: Confirmation wrapper and styles

This ticket is about documenting and creating a wrapper about bootbox.confirm

The confirmation modal is used in a number of places to force a user to confirm a choice that could be destructive.

The confirm factory should work like:

// Regular confirm window
Confirm('message.key');

// Confirm window with default confirm button text replaced
Confirm('message.key', 'foo.bar');

// Confirm window for a destructive action, with a callback
Confirm.destroy('message.key').then(function(){
  // do something if confirmed
}).catch(function(){
  // do something else when rejected
});