Add app/project name to uservoice

# Problem

Need to be able to route tickets to queues based on the app that generated the issue.

# Solution

There are three things in here, and any one of them is probably fine:
* project name in subject
* project name in message
* project name in `app` custom field

I have no idea how to execute or test this, so hopefully someone can let me know if this is right
We happen to use `app`, but this could be anything, I suppose.  My understanding is that custom fields don't need to be configured on the server side—they can just be used as needed.