* refactor code for tutorial mode.

module/tutorial/lang/en.php

@@ -29,6 +29,7 @@ $lang->tutorial->targetPageTip     = 'Open【%s】page by this instruction';
 $lang->tutorial->requiredTip      = '【%s】is necessary';
 $lang->tutorial->congratulateTask = 'Congratulations!You have finished task【<span class="task-name-current"></span>】!';
 $lang->tutorial->serverErrorTip   = 'Some error has occurred.';
+$lang->tutorial->ajaxSetError     = 'Finished task must be defined. Set empty value to reset tasks.';
 
 $lang->tutorial->tasks = array();
 

module/tutorial/lang/zh-cn.php

@@ -29,6 +29,7 @@ $lang->tutorial->targetPageTip    = '按此指示打开【%s】页面';
 $lang->tutorial->requiredTip      = '【%s】为必填项';
 $lang->tutorial->congratulateTask = '恭喜，你完成了任务 【<span class="task-name-current"></span>】！';
 $lang->tutorial->serverErrorTip   = '发生了一些错误。';
+$lang->tutorial->ajaxSetError     = '必须指定已完成的任务，如果要重置任务，请设置值为空。';
 
 $lang->tutorial->tasks = array();