GSMarkupLocalizableStrings: command not found

Have You tried accessing the binary with the full path?

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/GSMarkupLocalizableStrings - from package: librenaissance0-dev

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