horde-translation: 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/horde-translation - from package: php-horde-horde

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

On Debian possible default full paths are:

/usr/bin/horde-translation - from package: php-horde

You may install the required package with command apt-get install {package}

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