Update coauthors.html.erb

Author: lmrodriguezr

app/views/registers/coauthors.html.erb

@@ -49,7 +49,7 @@
 
   <br/>
   <%= f.button(:submit, 'Register coauthor') %>
-  <%= link_to('Cancel', @register, class: 'btn btn-secondary') %>
+  <%= link_to('Back to the list', @register, class: 'btn btn-secondary') %>
   <br/><br/>
 <% end %>