Display the number of paper and digital ballots in the frontend and make it clearer in the backend

[PierreMesure]

Right now, users can only see the aggregate number of votes in the frontend and it's not super clear in the backend. To avoid adding columns, I used X (Y/Z) with X the total, Y digital and Z paper votes.

In the backend, an elegant solution would be to add a tooltip, only visible when hovering. Although that wouldn't work on mobile.

In the frontend, the breakdown could be added on a project's page, under the total amount.