Redesign Licenses Screen

[kevinrpb]

(originally on #31):

I thought the TextView looked a bit odd with the rest of the design. I'm starting to refactor it a bit. So far I've put the licenses into a JSON (this also allows to manage them dynamically if they change; or even fetch them if appropriate). Using this, the Licenses navigation gets you to a table view that will display a line for each product.

Here's a preview of the new screen

I moved the PR because I updated the branch to follow Git Flow as the main repo.

I also accepted the suggestions made there.