Add emoji for /stats and /english/stats

Author: yasulab

app/views/stats/show.html.erb

@@ -12,7 +12,10 @@
 </section>
 
 <section class="stats text-center">
-  <h1><%= @lang == 'en' ? 'Statistics' : '統計情報' %></h1>
+  <h1>
+    🗾
+    <%= @lang == 'en' ? 'Statistics' : '統計情報' %>
+  </h1>
   <div style="margin: 30px 36px 0;">
     <% if @lang == 'en' %>
       This page presents statistics of CoderDojo in Japan.<br class="ignore-sp">