Google Translation:

Attention Users

A change has been made to the system today. Because of this, some functions like posting, commenting, submitting question, changing table page, sorting, filtering and etc may not be working.
In order for it to work again in your browser, refresh the page (whichever does not work) by the computer with Ctrl F5, as in the image below:

https://i.imgur.com/wb6UUti.jpg

Thanks for attention.