FIX: remove link from 500.html since it often won't work, and update …

…copy to not mention meta category name

public/500.html

@@ -8,6 +8,6 @@
     <h1>Oops</h1>
     <p>The software powering this discussion forum encountered an unexpected problem. We apologize for the inconvenience.</p>
     <p>Detailed information about the error was logged, and an automatic notification generated. We'll take a look at it.</p>
-    <p>No further action is necessary. However, if the error condition persists, you can provide additional detail, including steps to reproduce the error, by posting a discussion topic in the <a href="/category/meta">meta category</a>.</p>
+    <p>No further action is necessary. However, if the error condition persists, you can provide additional detail, including steps to reproduce the error, by posting a discussion topic in the site's feedback category.</p>
 </body>
 </html>