Update messages for special page names/aliases

What:
* Capitalized "API" in MessagesZh_hans.php
* Translated new special page names into Simplified Chinese

Change-Id: Ie6506c6bb004ebc89326094997a80d97551235ab

languages/messages/MessagesZh_hans.php

@@ -159,8 +159,9 @@
  'AllMyUploads' => [ '我上传的所有文件', '我的所有文件' ],
  'Allpages' => [ '所有页面' ],
  'Ancientpages' => [ '最老页面' ],
- 'ApiHelp' => [ 'Api帮助' ],
- 'ApiSandbox' => [ 'Api沙盒' ],
+ 'ApiHelp' => [ 'API帮助' ],
+ 'ApiSandbox' => [ 'API沙盒' ],
+ 'AuthenticationPopupSuccess' => [ '认证成功弹窗' ],
  'AutoblockList' => [ '自动封禁列表', '列出自动封禁' ],
  'Badtitle' => [ '错误标题', '无效标题' ],
  'Blankpage' => [ '空白页面' ],
@@ -257,13 +258,15 @@
  'RemoveCredentials' => [ '移除凭据' ],
  'Renameuser' => [ '重命名用户' ],
  'ResetTokens' => [ '重置权标' ],
+ 'RestSandbox' => [ 'REST沙盒' ],
  'Revisiondelete' => [ '删除修订', '恢复修订' ],
  'RunJobs' => [ '运行工作' ],
  'Search' => [ '搜索' ],
  'Shortpages' => [ '短页面' ],
  'Specialpages' => [ '特殊页面' ],
  'Statistics' => [ '统计信息' ],
  'Tags' => [ '标签' ],
+ 'TalkPage' => [ '讨论页' ],
  'TrackingCategories' => [ '追踪分类' ],
  'Unblock' => [ '解除封禁', '解封' ],
  'Uncategorizedcategories' => [ '未分类分类' ],