msgfilter: 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/msgfilter - from package: gettext

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

On Debian possible default full paths are:

/usr/bin/msgfilter - from package: gettext

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

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