redmine/app/views/issues/_issue_status_description.html.erb

<% if issue_statuses.any? {|s| s.description.present? } %>
  <div class="modal" id="issue_statuses_description">
    <h3 class="title"><%= l(:label_issue_statuses_description) %></h3>
      <dl>
      <% issue_statuses.each do |issue_status| %>
        <% if issue_status.description.present? %>
          <dt><%= content_tag 'a', issue_status.name, :onclick => "selectIssueStatus('#{issue_status.id}'); return false;", :href => '#', :title => l(:text_select_apply_issue_status) %></dt>
          <dd><%= issue_status.description %></dd>
        <% end %>
      <% end %>
      </dl>
  </div>
<% end %>
<%= javascript_tag do %>
  function selectIssueStatus(id) {
    var target = $('#issue_status_id');
    target.attr("selected", false);
    target.find('option[value="' + id + '"]').prop('selected', true);
    target.trigger('change');
    hideModal('#issue_statuses_description h3');
  }
<% end %>