gnome-translate: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On CentOS possible default full paths are:

/usr/bin/gnome-translate - from package: gnome-translate

You may install the required package with command yum install {package}

Error in other languages:
gnome-translate: bevel nie gevind nie
gnome-translate: comandă negăsită
gnome-translate: comando não encontrado
gnome-translate: commande introuvable
gnome-translate: command not found
gnome-translate: käsku ei ole
gnome-translate: không tìm thấy lệnh
gnome-translate: komanda nerasta
gnome-translate: Kommando nicht gefunden.
gnome-translate: kommandot finns inte
gnome-translate: komut yok
gnome-translate: nie znaleziono polecenia
gnome-translate: níor aimsíodh an t-ordú
gnome-translate: no se encontró la orden
gnome-translate: no s'ha trobat l'ordre
gnome-translate: opdracht niet gevonden
gnome-translate: parancs nem található
gnome-translate: perintah tidak ditemukan
gnome-translate: príkaz nenájdený
gnome-translate: příkaz nenalezen
gnome-translate: команда не найдена
gnome-translate: командата не е открита
gnome-translate: 命令找不到
gnome-translate: コマンドが見つかりません