app/views/channels/_podcast_link.html.erb
<%= link_to audio_feed_url, class: 'btn btn-primary' do %>
<i class="fa fa-headphones"></i> <%= t :subscribe %>
<% end %>
<% if Flipper.enabled? :video %>
<%= link_to video_feed_url, class: 'btn btn-primary' do %>
<i class="fa fa-video-camera"></i> <%= t :subscribe_video %>
<% end %>
<% end %>