Is your feature request related to a problem? Please describe.
When we added the new Epehemeral workflow (See: #13533), we defined a final successful screen.
In this screen, there are two CTAs that are not working: Share and Download. This issue is to fix that.

Describe the solution you'd like

When clicking on the Download CTA,
I should download a PDF with the basic information of the action done.
As an example:

You have voted in [process-name], for the following projects: 
  - [Project-name-1]
  - [Project-name-2]
  - [Project-name-3]
[Name]
[Date and time] 
[Digital signature] 

When clicking on the Share CTA.
Then I should see the share modal:

Screenshots