Refactor login username placeholder for localization support

Author: agile.zhou

src/AgileConfig.Server.UI/react-ui-antd/src/locales/en-US/pages.ts

@@ -41,7 +41,7 @@ export default {
     'AgileConfig - a light configuration server',
   'pages.login.accountLogin.tab': 'Account Login',
   'pages.login.accountLogin.errorMessage': 'Incorrect username/password（admin/ant.design)',
-  'pages.login.username.placeholder': 'Username: admin or user',
+  'pages.login.username.placeholder': 'Username',
   'pages.login.username.required': 'Please input your username!',
   'pages.login.password.placeholder': 'Password',
   'pages.login.password.required': 'Please input your password!',

src/AgileConfig.Server.UI/react-ui-antd/src/locales/zh-CN/pages.ts

@@ -40,7 +40,7 @@ export default {
   'pages.layouts.userLayout.title': 'AgileConfig - 轻量级配置中心',
   'pages.login.accountLogin.tab': '用户名密码登录',
   'pages.login.accountLogin.errorMessage': '错误的密码，请重新再试',
-  'pages.login.username.placeholder': '用户名: admin or user',
+  'pages.login.username.placeholder': '用户名',
   'pages.login.username.required': '用户名是必填项！',
   'pages.login.password.placeholder': '密码',
   'pages.login.password.required': '密码是必填项！',

src/AgileConfig.Server.UI/react-ui-antd/src/pages/User/login/index.tsx

@@ -93,7 +93,9 @@ const Login: React.FC<LoginProps> = (props) => {
                 size: 'large',
                 prefix: <UserOutlined className={styles.prefixIcon} />,
               }}
-              placeholder='用户名'
+              placeholder={intl.formatMessage({
+                id: 'pages.login.username.placeholder',
+              })}
               rules={[
                 {
                   required: true,