favors underscore for resource name resolution

SpendingProposal becomes spending_proposal instead of spendingproposal

app/views/shared/_errors.html.erb

@@ -8,7 +8,7 @@
       <% if local_assigns[:message].present? %>
         <%= message %>
       <% else %>
-        <%= t("form.not_saved", resource: t("form.#{resource.class.to_s.downcase}")) %>
+        <%= t("form.not_saved", resource: t("form.#{resource.class.to_s.underscore}")) %>
       <% end %>
     </strong>
   </div>