[Update] xpack/orgs组织添加删除功能-js; 修复Label继承Org后bug; (#1644)

* [Update] 更新xpack下orgs的翻译信息

* [Update] 更新model Label，继承OrgModelMixin;

* [Update] xpack/orgs组织添加删除功能-js; 修复Label继承Org后bug;

* [Bugfix] 修复小bug

apps/assets/models/label.py

@@ -4,9 +4,10 @@
 import uuid
 from django.db import models
 from django.utils.translation import ugettext_lazy as _
+from orgs.mixins import OrgModelMixin
 
 
-class Label(models.Model):
+class Label(OrgModelMixin):
     SYSTEM_CATEGORY = "S"
     USER_CATEGORY = "U"
     CATEGORY_CHOICES = (