Starts using invisible_captcha in the source code. Pending: tests, proper invisible_captcha gem in Gemfile

app/views/debates/_form.html.erb

@@ -1,5 +1,8 @@
 <%= form_for(@debate) do |f| %>
+
+
   <%= render 'shared/errors', resource: @debate %>
+
   <div class="row">
     <div class="small-12 column">
       <%= f.label :title, t("debates.form.debate_title") %>
@@ -11,6 +14,8 @@
       <%= f.cktext_area :description, maxlength: Debate.description_max_length, ckeditor: { language: I18n.locale }, label: false %>
     </div>
 
+    <%= f.invisible_captcha :subtitle %>
+
     <div class="small-12 column">
       <%= f.label :tag_list, t("debates.form.tags_label") %>
       <p class="note"><%= t("debates.form.tags_instructions") %></p>