Added a message that suggest to configure a proxy for a network.

chrome/browser/resources/chromeos/login/oobe.css

 /* Copyright (c) 2012 The Chromium Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  *
  * This is the stylesheet used by the Out of the box experience (OOBE) flow,
  * sign in and lock screens.
  */
 
 html,
 body {
@@ skipping 210 matching lines @@
   font-family: inherit;
   line-height: 20px;
   position: relative;
   width: 250px;
 }
 
 .label {
   display: block;
   margin: 5px 5px 5px 0;
   padding: 5px 5px 5px 0;
-  width: 170px;

[Nikita (slow), 2012/04/25 10:29:50]

This should not be removed as it will affect OOBE welcome screen layout.

You probably need a custom style for label on error screen but make sure that
you'll also have some width defined otherwise translated message might be to
long (in this case it is fine if it splits into 2 lines).

[ygorshenin1, 2012/04/25 13:53:13]

Done.

 }
 
 #connect {
   box-sizing: border-box;
   padding: 60px 0 0 145px;
 }
 
 #logging {
   clear: both;
   font-size: small;
@@ skipping 516 matching lines @@
 }
 
 #notification-area a {
   color: rgb(37, 79, 155);
 }
 
 #notification-area .butter-bar {
   margin: 0 auto;
   max-width: 850px;
 }