Mobile Issue on Process page

❌ Issue

On Mobile, on a Process page:

• The layout of the listing of Proposals is not optimal. A lot of width is lost for the actual list of proposals.
• The button Voir toutes les propositions takes a lot of horizontal space and forces the Title on two lines.
• The button Nouvelle proposition is on two lines and doesn't help the layout.

✅ Expected

• Use the full width to show the Proposals list
• Rename Voir toutes les propositions -> Tout afficher (same as "Participations")
• Rename Nouvelle proposition -> Nouveau