imsettings-applet: 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/imsettings-applet - from package: imsettings

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

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