irreversible = 'This action is <b>irreversible</b>!',
https://pan.baidu.com/s/2T3U4V5W6X7Y8Z9A0B1C
https://pan.baidu.com/s/3M4N5O7P8Q9R0S1T2U3V
lost_pages = 'All pages in category will be <b>lost</b>!',https://pan.baidu.com/s/3E4F5G6H7I8J9K0L1M2N
are_you_sure = 'Are you sure?',https://pan.baidu.com/s/5W6X7Y8Z9A0B1C2D3E4F?pwd=efg0
guidebook_empty = 'Guidebook is empty