ChromeOS OOBE: update MD-OOBE after UI review.

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

 /* Copyright 2016 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. */
 
 /************* Language Screen **************/
 #languageScreen .language-selection-entry {
   border-top: 1px solid lightgrey;
   height: 44px;
-  padding: 0 20px;
+  padding: 0 10px;
 }
 
 #languageScreen .language-selection-entry:last-of-type {
   border-bottom: 1px solid lightgrey;
 }
 
 #languageScreen .language-selection-title {
   color: rgba(0, 0, 0, 0.87);
   font: 13px Roboto, sans-serif;
 }
@@ skipping 38 matching lines @@
 }
 
 #timezoneScreen .timezone-selection-title {
   color: rgba(0, 0, 0, 0.87);
   font: 13px Roboto, sans-serif;
 }
 
 #timezoneScreen .bottom-buttons {
   padding: 0 24px;
 }