They mean sparkling wine. It’s called Perlwein in German, hence the mistranslation.

Judging by the statement and username, Germany. And I agree

So apparently for the latter you can just claim to be using the american pronunciation https://dictionary.cambridge.org/dictionary/english/penchant

Can the term potency also be used to refer to the exponent in English? Because that is what is meant by the terms in the other languages and I haven’t come across that usage of the word potency in English

Huh? I only know copyleft, what are those?