custom menu visibility

resources/lang/en/label.php

@@ -206,5 +206,6 @@ return [
         'target' => 'Open type',
         'style' => 'Style',
         'parent_id' => 'Parent',
+        'min_class' => 'Minimum visible class',
     ],
 ];

resources/lang/zh_CN/label.php

@@ -209,5 +209,6 @@ return [
         'target' => '打开方式',
         'style' => '样式',
         'parent_id' => '父菜单',
+        'min_class' => '最低可见等级',
     ],
 ];

resources/lang/zh_TW/label.php

@@ -206,5 +206,6 @@ return [
         'target' => '打開方式',
         'style' => '樣式',
         'parent_id' => '父菜單',
+        'min_class' => '最低可見等級',
     ],
 ];