Add china mirror link in footer

site/theme/en-US.js

@@ -34,6 +34,7 @@ module.exports = {
     'app.home.vision': 'This is a design language dedicated to improve the user and design experience.',
     'app.footer.repo': 'GitHub Repository',
     'app.footer.awesome': 'Awesome Ant Design',
+    'app.footer.chinamirror': 'China Mirror 🇨🇳',
     'app.footer.primary-color-changed': 'Change primary color successfully!',
     'app.footer.scaffold': 'Scaffold',
     'app.footer.scaffolds': 'Scaffold Market',

site/theme/template/Layout/Footer.jsx

@@ -106,6 +106,11 @@ class Footer extends React.Component {
                 <FormattedMessage id="app.footer.awesome" />
               </a>
             </div>
+            <div>
+              <a target="_blank " href="http://ant-design.gitee.io/">
+                <FormattedMessage id="app.footer.chinamirror" />
+              </a>
+            </div>
             <div style={{ marginTop: 12 }}>
               <ColorPicker
                 type="sketch"

site/theme/zh-CN.js

@@ -34,6 +34,7 @@ module.exports = {
     'app.home.vision': '这是一套致力于提升『用户』和『设计者』使用体验的中后台设计语言。',
     'app.footer.repo': 'GitHub 仓库',
     'app.footer.awesome': 'Awesome Ant Design',
+    'app.footer.chinamirror': '国内镜像站点 🇨🇳',
     'app.footer.primary-color-changed': '修改主题色成功！',
     'app.footer.scaffold': '脚手架',
     'app.footer.scaffolds': '脚手架市场',