fix: remove the reset-to-defaults button from tag settings

If you carefully crafted your tags and then click this button by accident, all
your hard work is gone. A confirmation message would be the other solution but
since I have difficulty to grasp when you would need such a button, I propose
to just remove it.

locales/zh/common.json

@@ -1016,7 +1016,6 @@
       "title": "电子邮件标签",
       "description": "定义标签以使用颜色组织您的电子邮件。这些标签作为JMAP关键词存储在服务器上。",
       "add_keyword": "添加标签",
-      "reset_defaults": "重置为默认值",
       "label_field": "显示名称",
       "label_placeholder": "例如工作、个人、紧急",
       "id_field": "标签ID",