I am also experiencing this in the sites that I’ve visited so far. They don’t seem to be compatible with Safari’s translate feature. I’ve visited sites in German and Japanese, no translation option.
This is a very lousy implementation of what would have been a huge feature in iOS 14. Even the Translate app gives very bad translations (German to English).
EDIT:
I just saw this in the iPadOS 14 page:
Safari can now translate websites in seven different languages.9
And when you look at the footnote:
9. Available in the U.S. and Canada. Support for English, Spanish, Simplified Chinese, French, German, Russian, and Brazilian Portuguese.
Typical Apple. I’m frustrated every time I see such things. We pay them the same, or even more money, but we don’t get all the features they advertise.