Re: How do I force prompts to be in English
First, you should isolate WinSCP script run from GUI configuration:
https://winscp.net/eng/docs/scripting#configuration
If WinSCP defaults to German anyway (because you have German locale set in Windows), force English by:
https://winscp.net/eng/docs/rawconfig
https://winscp.net/eng/docs/scripting#configuration
If WinSCP defaults to German anyway (because you have German locale set in Windows), force English by:
winscp.com /rawconfig Interface\LocaleSafe=1033
https://winscp.net/eng/docs/rawconfig