i18n: Update zh-CN [ Chinese (China) ] translations. (#2699)

* Update zh-CN translations.

* Update doorkeeper.zh-CN.yml

* Follow @Artoria2e5 's change advices.

* forget mail for text format ......

* fix some changes

* mail's html version ......

* https://github.com/tootsuite/mastodon/pull/2699#pullrequestreview-35982283

* a space.....

* delete some unused keys

config/locales/doorkeeper.zh-CN.yml

@@ -15,7 +15,6 @@ zh-CN:
               invalid_uri: '必须是有效的 URL 格式'
               relative_uri: '必须是绝对的 URL 地址'
               secured_uri: '必须是 HTTPS/SSL 的 URL 地址'
-
   doorkeeper:
     applications:
       confirmations:
@@ -124,4 +123,9 @@ zh-CN:
           home: '首页'
       application:
         title: 'OAuth 认证'
+    scopes:
+      follow: 关注（或取消关注），屏蔽（或取消屏蔽）用户
+      read: 读取你的账户数据
+      write: 为你发表嘟文
+