Encourage user to set email in issue reporter

chrome/skin/sendReport.css

 /*
  * This file is part of the Adblock Plus,
  * Copyright (C) 2006-2012 Eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 75 matching lines @@
 #screenshotButtons
 {
   margin-top: 10px;
 }
 
 #screenshotBox
 {
   overflow-y: scroll;
 }
 
-#commentLengthWarning
+#commentLengthWarning, #anonymityWarning
 {
   color: red;
 }
 
-#commentLengthWarning[visible="false"]
+#commentLengthWarning[visible="false"], #anonymityWarning[visible="false"]
 {
   visibility: hidden;
 }
 
 /*
  * Force left-to-right everywhere where we are displaying addresses
  */
 #data:-moz-locale-dir(rtl)
 {
   direction: ltr;
 }
 
 #sendReportError
 {
   color: red;
   font-size: 150%;
 }
 
 #sendReportErrorLinks, #typeWarningTextLink
 {
   margin: 0px;
 }
 
 #sendReportErrorBox
 {
   margin-bottom: 10px;
 }