Display active_accounts in the subreddit infobar.

Add a CSS class for users-online.

r2/r2/public/static/css/reddit.css

@@ -5655,3 +5655,11 @@ tr.gold-accent + tr > td {
 #otp-secret-info .secret {
     font-weight: bold;
 }
+
+.users-online {
+    margin-bottom: .25em;
+}
+
+.users-online .word, .users-online .number:after {
+    cursor: help;
+}

r2/r2/templates/subredditinfobar.html

@@ -35,7 +35,14 @@
   </h1>
 
   ${addremove_button(thing.sr)}
-  ${unsafe(Score.readers(thing.subscribers))}
+  <span class="subscribers">${unsafe(Score.readers(thing.subscribers))}</span>
+  <p class="users-online" title="${_('number of logged-in users in the past 15 minutes')}">
+      %if thing.sr.accounts_active < 100 and not c.user_is_admin:
+          ${unsafe(Score.users_online(100, prepend='<'))}
+      %else:
+          ${unsafe(Score.users_online(thing.sr.accounts_active))}
+      %endif
+  </p>
 
   %if thing.sr.moderator:
     <div class="leavemoderator">