I like all the error handling, but you could skip the temp files if you just pipe it through

    #!/usr/bin/env bash
    langs=(eng ara fas chi_sim chi_tra deu ell fin heb hun jpn kor nld rus tur)
    lang=$(printf '%s\n' "${langs[@]}" | fuzzel -d "$@")
    grim -g "$(slurp)" - | mogrify -modulate 100,0 -resize 400% png:- | tesseract -l eng+${lang} - - | wl-copy
    notify-send "Text extracted"