app/views/admin/outgoing_messages/snippets/_form.html.erb
<%= f.error_messages %>
<% f.translated_fields do |t| %>
<%= render partial: 'locale_fields', locals: { t: t } %>
<% end %>
<h3>Common Fields</h3>
<div class="control-group">
<%= f.label :tags, class: 'control-label' %>
<div class="controls">
<%= f.text_field :tag_string, class: 'span4' %>
</div>
</div>