Thank you - but i solved it by myself. I wrote a custom action which finds the right ISO-Code.
If it detects the right string for searching in my translation table. Although I habe a lookup-table with all currencys and my Translation table the bot understand “US Dollar” as USD “Norwegische Krone” as NOK “Australischer Dollar” as AUD
but “Kanadischer Dollar” as Dollar and not as “Kanadischer Dollar”. Yes my bot “speaks” german - and this is an additional problem, because the word endings are differ in grammer. I can add trainings data but not as many as my lookup-tables have.