app/views/settings/proposition_statements/_form.html.erb
<%= semantic_form_for [:settings, proposition_statement] do |f| %>
<%= f.inputs do %>
<%= f.input :name %>
<%= f.input :description %>
<% end %>
<%= f.actions do %>
<%= f.action :submit, button_html: { class: 'btn btn-primary' } %>
<% end %>
<% end %>