* Optimize code.

module/upgrade/lang/en.php

@@ -21,8 +21,8 @@ $lang->upgrade->warnning        = 'Warning!';
 $lang->upgrade->checkExtension  = 'Check Extensions';
 $lang->upgrade->consistency     = 'Check Consistency';
 $lang->upgrade->warnningContent = <<<EOT
-<p>The upgrade requires high database privileges, please use the root user.</p>
-<p>Please backup your database before updating ZenTao!</p>
+<p>The upgrade requires high database privileges, please use the root user.<br>
+   Please backup your database before updating ZenTao!</p>
 <pre>
 1. Use phpMyAdmin to backup.
 2. Use mysqlCommand to backup.

module/upgrade/lang/zh-cn.php

@@ -21,8 +21,8 @@ $lang->upgrade->warnning        = '警告';
 $lang->upgrade->checkExtension  = '检查插件';
 $lang->upgrade->consistency     = '一致性检查';
 $lang->upgrade->warnningContent = <<<EOT
-<p>升级对数据库权限要求较高，请使用root用户。</p>
-<p>升级有危险，请先备份数据库，以防万一。</p>
+<p>升级对数据库权限要求较高，请使用root用户。<br>
+   升级有危险，请先备份数据库，以防万一。</p>
 <pre>
 1. 可以通过phpMyAdmin进行备份。
 2. 使用mysql命令行的工具。