put recaptcha in helper method

app/helpers/form_tag_helper.rb

@@ -0,0 +1,17 @@
+module FormTagHelper
+  def recaptcha_input_tag
+    if Rails.configuration.x.enable_recaptcha
+      res = "<div class='form-group "
+      res << 'has-error' if flash[:recaptcha_error]
+      res << "'>"
+      res << recaptcha_tags
+      if flash[:recaptcha_error]
+        res << "<span class='help-block'>"
+        res << flash[:recaptcha_error]
+        res << '</span>'
+      end
+      res << '</div>'
+      res.html_safe
+    end
+  end
+end

app/views/users/registrations/new.html.erb

@@ -38,12 +38,7 @@
       <span><small><%= t 'users.registrations.new.team_name_help' %></small></span>
     </div>
 
-    <% if Rails.configuration.x.enable_recaptcha %>
+    <%= recaptcha_input_tag %>
-      <div class="form-group">
-        <%= recaptcha_tags %>
-        <%= flash[:recaptcha_error] %>
-      </div>
-    <% end %>
 
     <div class="form-group">
       <%= f.submit "Sign up", class: "btn btn-primary" %>