新增一处后台语言

application/admin/controller/Index.php

@@ -76,12 +76,12 @@ class Index extends Backend
             $result = $this->auth->login($username, $password, $keeplogin ? 86400 : 0);
             if ($result === true)
             {
-                $this->success(__('Login success'), $url);
+                $this->success(__('Login successful'), $url);
                 return;
             }
             else
             {
-                $this->success(__('Username or password is incorrect'), $url);
+                $this->error(__('Username or password is incorrect'), $url);
             }
             return;
         }

application/admin/lang/zh-cn.php

@@ -107,6 +107,7 @@ return [
     'Username or password is incorrect'                     => '用户名或密码不正确',
     'Username is incorrect'                                 => '用户名不正确',
     'Password is incorrect'                                 => '密码不正确',
+    'Login successful'                                      => '登录成功!',
     'Verification code is incorrect'                        => '验证码不正确',
     'An unexpected error occurred'                          => '发生了一个意外错误,程序猿正在紧急处理中',
     'This page will be re-directed in %s seconds'           => '页面将在 %s 秒后自动跳转',