It says
Failed password […] FROM 192.168.0.12
so 192.168.0.18 is your DietPi device and 192.168.0.12 is the machine from where you tried to connect to your DietPi via SSH, probably a desktop PC/ laptop?
Everything is fine with the IPs, SSH IP is the IP of your device, you only have this one, don’t worry about this 
It’s not about the keyboard, but which keyboard layout you set in your OS. I have a german keyboard but when I use UK layout and I press Z, the operating system shows an Y. So what you see on your keyboard is not always what your operating system receives. It depends on your localization settings and as Joulianr already set, the default layout is UK, which can diver from the layout of the machine you use for SSHing into your DietPi.