diff --git a/app/Http/Controllers/HomeController.php b/app/Http/Controllers/HomeController.php
index a44b50c7..8fc891b7 100644
--- a/app/Http/Controllers/HomeController.php
+++ b/app/Http/Controllers/HomeController.php
@@ -15,17 +15,4 @@ class HomeController extends Controller
         return view('index')->with('user', $users->getCurrentUser());
     }
 
-    public function locale($lang, Request $request)
-    {
-        if (Arr::exists(config('locales'), $lang)) {
-            Session::set('locale', $lang);
-        }
-
-        if (isset($_SERVER['HTTP_REFERER'])) {
-            return redirect('/')->setTargetUrl($_SERVER['HTTP_REFERER'])->withCookie('locale', $lang);
-        } else {
-            return redirect('/')->withCookie('locale', $lang);
-        }
-    }
-
 }
diff --git a/app/Http/Controllers/SetupController.php b/app/Http/Controllers/SetupController.php
index 3a11abb8..d9ed7662 100644
--- a/app/Http/Controllers/SetupController.php
+++ b/app/Http/Controllers/SetupController.php
@@ -16,15 +16,6 @@ use App\Exceptions\PrettyPageException;
 
 class SetupController extends Controller
 {
-    public function __construct(Request $request)
-    {
-        if ($locale = $request->input('lang')) {
-            cookie()->queue('locale', $locale);
-            session(['locale' => $locale]);
-            app()->setLocale($locale);
-        }
-    }
-
     public function welcome()
     {
         // already installed
diff --git a/config/datatables.php b/config/datatables.php
index f5cc2b3b..05522831 100644
--- a/config/datatables.php
+++ b/config/datatables.php
@@ -39,60 +39,8 @@ return [
         'serializer' => 'League\Fractal\Serializer\DataArraySerializer',
     ],
 
-    /**
-     * DataTables script view template.
-     */
-    'script_template' => 'datatables::script',
-
     /**
      * DataTables internal index id response column name.
      */
     'index_column'    => 'DT_Row_Index',
-
-    /**
-     * Namespaces used by the generator.
-     */
-    'namespace'       => [
-        /**
-         * Base namespace/directory to create the new file.
-         * This is appended on default Laravel namespace.
-         * Usage: php artisan datatables:make User
-         * Output: App\DataTables\UserDataTable
-         * With Model: App\User (default model)
-         * Export filename: users_timestamp
-         */
-        'base'  => 'DataTables',
-
-        /**
-         * Base namespace/directory where your model's are located.
-         * This is appended on default Laravel namespace.
-         * Usage: php artisan datatables:make Post --model
-         * Output: App\DataTables\PostDataTable
-         * With Model: App\Post
-         * Export filename: posts_timestamp
-         */
-        'model' => '',
-    ],
-
-    /**
-     * PDF generator to be used when converting the table to pdf.
-     * Available generators: excel, snappy
-     * Snappy package: barryvdh/laravel-snappy
-     * Excel package: maatwebsite/excel
-     */
-    'pdf_generator'   => 'excel',
-
-    /**
-     * Snappy PDF options.
-     */
-    'snappy'          => [
-        'options'     => [
-            'no-outline'    => true,
-            'margin-left'   => '0',
-            'margin-right'  => '0',
-            'margin-top'    => '10mm',
-            'margin-bottom' => '10mm',
-        ],
-        'orientation' => 'landscape',
-    ],
 ];
diff --git a/resources/lang/en/errors.yml b/resources/lang/en/errors.yml
index a435a760..b48c0d46 100644
--- a/resources/lang/en/errors.yml
+++ b/resources/lang/en/errors.yml
@@ -7,5 +7,7 @@ general:
   title: Error occurred
 
 exception:
+  code: 'Error code: :code'
+  detail: 'Details: :msg'
   message: |
     Whoops, looks like something went wrong. (enable APP_DEBUG in .env to see details)
diff --git a/resources/lang/zh_CN/errors.yml b/resources/lang/zh_CN/errors.yml
index 31db5b5c..96e97cfe 100644
--- a/resources/lang/zh_CN/errors.yml
+++ b/resources/lang/zh_CN/errors.yml
@@ -7,6 +7,8 @@ general:
   title: 出现错误
 
 exception:
+  code: 'Error code: :code'
+  detail: 错误码：:code
   message: |
     如果您是访客，这说明网站程序出现了一些错误，请您稍后再试或联系站长。
     如果您是站长，请开启 .env 中的 APP_DEBUG 以查看详细信息。
diff --git a/resources/views/errors/403.tpl b/resources/views/errors/403.tpl
index eb83b47a..ec95becb 100644
--- a/resources/views/errors/403.tpl
+++ b/resources/views/errors/403.tpl
@@ -7,5 +7,5 @@
 @include('setup.wizard.language')
 </h1>
 
-<p>{{ trans('errors.exception.message', ['msg' => $exception->getMessage() ?: trans('errors.http.msg-403')]) }}</p>
+<p>{{ trans('errors.exception.detail', ['msg' => $exception->getMessage() ?: trans('errors.http.msg-403')]) }}</p>
 @endsection
diff --git a/resources/views/errors/404.tpl b/resources/views/errors/404.tpl
index d9544524..61ff5813 100644
--- a/resources/views/errors/404.tpl
+++ b/resources/views/errors/404.tpl
@@ -7,5 +7,5 @@
 @include('setup.wizard.language')
 </h1>
 
-<p>{{ trans('errors.exception.message', ['msg' => $exception->getMessage() ?: trans('errors.http.msg-404')]) }}</p>
+<p>{{ trans('errors.exception.detail', ['msg' => $exception->getMessage() ?: trans('errors.http.msg-404')]) }}</p>
 @endsection
diff --git a/resources/views/errors/503.tpl b/resources/views/errors/503.tpl
index 143c4c8d..82fdb499 100644
--- a/resources/views/errors/503.tpl
+++ b/resources/views/errors/503.tpl
@@ -7,5 +7,5 @@
 @include('setup.wizard.language')
 </h1>
 
-<p>{{ trans('errors.exception.message', ['msg' => $exception->getMessage() ?: trans('errors.http.msg-503')]) }}</p>
+<p>{{ trans('errors.exception.detail', ['msg' => $exception->getMessage() ?: trans('errors.http.msg-503')]) }}</p>
 @endsection
diff --git a/resources/views/errors/pretty.tpl b/resources/views/errors/pretty.tpl
index 6df382fd..567947fc 100644
--- a/resources/views/errors/pretty.tpl
+++ b/resources/views/errors/pretty.tpl
@@ -8,5 +8,5 @@
 </h1>
 
 <p>{{ trans('errors.exception.code', ['code' => $code]) }}</p>
-<p>{!! trans('errors.exception.message', ['msg' => $message]) !!}</p>
+<p>{!! trans('errors.exception.detail', ['msg' => $message]) !!}</p>
 @endsection
diff --git a/resources/views/vendor/language.tpl b/resources/views/vendor/language.tpl
index 0861e4a7..e595e51a 100644
--- a/resources/views/vendor/language.tpl
+++ b/resources/views/vendor/language.tpl
@@ -7,7 +7,7 @@
     </a>
     <ul class="dropdown-menu" role="menu">
         @foreach(config('locales') as $code => $langInfo)
-        <li class="locale"><a href="{{ url('/locale/'.$code) }}">{{ $langInfo['name'] }}</a></li>
+        <li class="locale"><a href="?lang={{ $code }}">{{ $langInfo['name'] }}</a></li>
         @endforeach
     </ul>
 </li>