msgen: 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/msgen - from package: gettext

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

On Debian possible default full paths are:

/usr/bin/msgen - from package: gettext

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

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