adds code to proposal's show

app/views/proposals/show.html.erb

@@ -53,6 +53,8 @@
           <i class="icon-comments"></i>&nbsp;
           <%= link_to t("proposals.show.comments", count: @proposal.comments_count), "#comments" %>
           <span class="bullet">&nbsp;&bull;&nbsp;</span>
+          <%= @proposal.code %>
+          <span class="bullet">&nbsp;&bull;&nbsp;</span>
           <span class="js-flag-actions">
             <%= render 'proposals/flag_actions', proposal: @proposal %>
           </span>

spec/features/proposals_spec.rb

@@ -40,6 +40,7 @@ feature 'Proposals' do
     visit proposal_path(proposal)
 
     expect(page).to have_content proposal.title
+    expect(page).to have_content proposal.code
     expect(page).to have_content "Proposal question"
     expect(page).to have_content "Proposal description"
     expect(page).to have_content "http://external_documention.es"