apertium-tolk: 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 Debian possible default full paths are:

/usr/bin/apertium-tolk - from package: apertium-tolk

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

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