Solution:
sudo apt-get install -y language-pack-en
sudo update-locale
Then zsh
starts working!
Great, it works!
Magic! Thank you!
What to do in arch ?
Works, Thank you
On Debian (with ohmyzsh) I added
export LANG="en_GB.UTF-8"
export LC_ALL="en_GB.UTF-8"
before the source $ZSH/oh-my-zsh.sh
it works on oh-my-zsh!!
This is what I was looking for, many thanks.
Thanks, it works!