Moves back links inside a partial

app/views/pages/spending_proposals_info.html.erb

@@ -1,9 +1,6 @@
 <div class="row margin-top">
   <div class="small-12 medium-3 column">
-    <%= link_to "/more_information", class: 'back' do %>
-      <span class="icon-angle-left"></span>
-      <%= t("debates.show.back_link") %>
-    <% end %>
+    <%= render "shared/back_link" %>
 
     <ul class="menu vertical margin-top">
       <li><a href="#i"><strong>Explicación detallada del proceso</strong></a></li>