Fix some lingering references to #<reddit>

r2/r2/templates/message.compact

@@ -34,7 +34,7 @@
        %if thing.sr_id:
          <span class="correspondent reddit rounded">
            <a href="${thing.subreddit.path}message/moderator/inbox.compact">
-             #${thing.subreddit.name}
+             /r/${thing.subreddit.name}
            </a>
          </span>
        %else:

r2/r2/templates/messagecompose.html

@@ -50,7 +50,7 @@ function admincheck(elem) {
 
 <div class="spacer">
   <%utils:round_field title="${_('to')}", 
-                      description="${_('(username, or # followed by the reddit name)')}">
+                      description="${_('(username, or /r/ followed by the reddit name)')}">
     <input type="text" name="to" value="${thing.to or ''}"
            onchange="admincheck(this)"/>
     ${error_field("NO_USER", "to")}