To change language edit NeroPortable.ini with Language=xx-XX 
(cs-CZ, da-DK, de-DE, el-GR, en-US, es-ES, fi-FI, fr-FR, hu-HU, 
it-IT, ja-JP, ko-KR, nb-NO, nl-NL, pl-PL, pt-BR, pt-PT, ru-RU, 
sv-SE, th-TH, tr-TR, zh-CN, zh-TW) and delete Data folder before restarting.