app/views/track/_track_set.html.erb
<% track_thing = TrackThing.find(track_thing_id) %>
<% if user_receive_email_alerts %>
<%= subscribe_email_notice(track_thing) %>
<%= link_to _('Prefer not to receive emails?'),
show_user_wall_path(:url_name => user_url_name) %>
<% else %>
<%= subscribe_follow_notice(track_thing) %>
<% end %>