app/views/users/_toggle_manager_link.html.erb
<%= link_to member.toggle_manager_member_path,
class: 'action',
method: :put,
data: { confirm: t('users.index.manage_warning', username: member.username) } do %>
<% if member.manager? %>
<%= glyph :arrow_down %>
<%= t 'global.demote' %>
<% else %>
<%= glyph :arrow_up %>
<%= t 'global.promote' %>
<% end %>
<% end %>