Use the -l command-line option to select the language. For example, to launch amulecmd in English, you should type: "amulecmd -l en". If you mostly want to use English, then it is adviced to do once "amulecmd -l en -w", which will write command-line options to config file (-l en in this case), and next time, if you don't specify a language, English will be used.