Extract and run Notepad++Portable.
If you use as default editor (F4) in Total Commander edit Notepad++Portable.ini with AllowMultipleInstances=true.
Language set by launcher according Windows localization : Arabic, Bulgarian, Catalan, Croatian, Czech, Danish, Dutch, Farsi, Finnish, French, German, Greek, Hebrew, Hungarian, Indonesian, Italian, Japanese, Korean, Lithuanian, Norwegian, Polish, Portuguese, PortugueseBR, Romanian, Russian, SimpChinese, Slovak, Slovenian, Spanish, Swedish, TradChinese, Turkish, Ukrainian.
You can change Language in Settings-Preference...Localization Menu.
Settings of installed Notepad++ should be preserved.