msgconv: 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/msgconv - from package: gettext

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

On Debian possible default full paths are:

/usr/bin/msgconv - from package: gettext

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

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