ref: master
app/views/users/_index_buttons.html.erb
<%= button_bar do %>
<%= button :'text-plain', _('User list as [CSV]'), :action => 'download.csv' %>
<%= button :'text-html', _('User list as [XML]'), :action => 'download.xml' %>
<%= button :send, _('Send e-mail to users'), :action => 'send_mail' %>
<%= button :back, _('Back'), :controller => 'admin_panel' %>
<% end %>