ZSH configuration for GBT

zshrc

###[ ZSH ]

# History
HISTFILE=~/.zsh_history
HISTSIZE=10000
SAVEHIST=10000
setopt append_history
setopt extended_history
setopt hist_expire_dups_first
setopt hist_ignore_dups
setopt hist_ignore_space
setopt hist_verify
setopt inc_append_history
setopt share_history

# Prompt
autoload -U promptinit
promptinit
setopt PROMPT_SUBST

# Other options
setopt rmstarsilent
setopt interactivecomments

# Keybinding
bindkey -e
bindkey '^i' expand-or-complete-prefix
bindkey '^[[1;5C' forward-word
bindkey '^[[1;5D' backward-word
bindkey '^[[H' beginning-of-line
bindkey '^[[F' end-of-line
bindkey "${terminfo[khome]}" beginning-of-line
bindkey "${terminfo[kend]}" end-of-line
bindkey "${terminfo[kcbt]}" reverse-menu-complete
bindkey "${terminfo[kdch1]}" delete-char
autoload -U select-word-style
select-word-style bash

# Auto-completion
autoload -U compinit
compinit
zstyle ':completion:*' matcher-list 'm:{a-zA-Z}={A-Za-z}' 'r:|=*' 'l:|=* r:|=*'
zstyle ':completion:*' menu select


###[ Other ]

# Default editor
export EDITOR='vim'

# Aliases
alias grep='/usr/bin/grep --color=auto'
alias ll='ls --color -l'
alias ls='ls --color=auto'

# Midnight Commander chdir enhancement
if [ -f /usr/lib/mc/mc.sh ]; then
    source /usr/lib/mc/mc.sh
fi

# Syntax highlighting
if [ -f /usr/share/zsh/plugins/zsh-syntax-highlighting/zsh-syntax-highlighting.zsh ]; then
    source /usr/share/zsh/plugins/zsh-syntax-highlighting/zsh-syntax-highlighting.zsh

    ZSH_HIGHLIGHT_STYLES[globbing]='fg=cyan'
    ZSH_HIGHLIGHT_STYLES[history-expansion]='fg=cyan'
    ZSH_HIGHLIGHT_STYLES[comment]='fg=white,bold'
fi

# History substring serach
if [ -f /usr/share/zsh/plugins/zsh-history-substring-search/zsh-history-substring-search.zsh ]; then
    source /usr/share/zsh/plugins/zsh-history-substring-search/zsh-history-substring-search.zsh

    bindkey '^[[A' history-substring-search-up
    bindkey '^[[B' history-substring-search-down
fi

# GBT prompt forwarding
export GBT__HOME='/usr/share/gbt'

if [ -f $GBT__HOME/sources/gbts/cmd/local.sh ]; then
    source $GBT__HOME/sources/gbts/cmd/local.sh
fi

# Basic prompt for non-graphical terminals
if [[ "$TERM" != xterm* ]] && [ -f $GBT__HOME/themes/basic.sh ]; then
    source $GBT__HOME/themes/basic.sh
fi

# GBT prompt
PROMPT='$(gbt $?)'

you need to add the following lines to enable utf encoding:
export LANG=en_US.UTF-8
export LC_ALL=en_US.UTF-8

That should be set in your system locale. It should be set in one of these files (depends on your Linux distro):

# Ubuntu, Debian
/etc/default/locale
# CentOS, RHEL, Arch Linux
/etc/locale.conf

If you are using KDE Plasma, you should ~/.config/plasma-localerc and if that's set to LANG=C you should disable it in System Settings -> Regional Settings -> Formats -> Region -> No change