No, you do not need a language override. It's not a language string. I can also tell that you have not read
the documentation :)
Go to Admin Tools, Web Application Firewall, Configure WAF, Auto-ban and change the
Show this message to blocked IPs setting.
While you are at it, click on the Customisation tab and change the
Custom message setting which is shown whenever a request is blocked.
Nicholas K. Dionysopoulos
Lead Developer and Director
🇬🇷Greek: native 🇬🇧English: excellent 🇫🇷French: basic • 🕐 My time zone is Europe / Athens
Please keep in mind my timezone and cultural differences when reading my replies. Thank you!