app/views/stats/index.html.erb
<h1><%= t :stats %></h1>
<h2><%= t :episodes %></h2>
<%= simple_metric_graph StatsController::AUDIO_EPISODES_KEY, StatsController::VIDEO_EPISODES_KEY %>
<h2><%= t :pending %></h2>
<%= simple_metric_graph StatsController::PENDING_AUDIO_EPISODES_KEY, StatsController::PENDING_VIDEO_EPISODES_KEY %>
<h2><%= t :podcasts %></h2>
<%= simple_metric_graph StatsController::PODCASTS_KEY %>