redmine_glossary/app/views/glossary_terms/new.html.erb

<h2><%=l :label_glossary_term_new %></h2>

<%= labelled_form_for :glossary_term, @term,
url: project_glossary_terms_path, html: {multipart: true, id: 'term-form'} do |f| %>
  <%= render partial: 'glossary_terms/form', locals: {form: f} %>
  <%= f.submit l(:button_create) %>
  <%= preview_link preview_project_glossary_terms_path(@project), 'term-form' %>
<% end %>

<div id="preview" class="wiki"></div>