Keyboard layout with disk encryption
Firstly I'd like to say that Calamares is the best graphical installer I've used on any system so thank you to everyone who's worked on it.
I have, however, found what I consider to be a bug. When booting into the live media, I selected the UK english keyboard (en-gb). I also selected this for my keyboard layout during the install.
When installing, I selected to wipe the disk and install manjaro, I selected the encrypt checkbox and entered my password - using the UK keyboard. However, when booting into the system, the keyboard layout was a US keyboard when entering the decryption password. This makes inputting some keys difficult / impossible.
Personally, I think whatever the user chooses when installing the system should be set as the grub keylayout as well as the system's. Here are a few references that might be useful.