How to set a correct keyboard layout in i3 window manager

Recently I rediscovered for myself the i3 desktop environment, got tired of windows spread here and there, but I am using an Apple aluminum keyboard with french letters and numeric keypad (just used to it), and I just hated that the layout did not correspond to what is marked on the buttons out of the box. To try to find a solution I googled and tried many things. I eventually ended up using

localectl

to set the correct keyboard layout. So below are the steps which might help you out: