Thank you Kovid for the fix.
And thank you to jackie_w.
I realize now why Polish books was doing something that seemed strange to me. First of all, I did not realize, how big the differences between Epub2 and Epub3 were.
Also in Polish books I chose the option "Upgrade book internals" the description for that is:" Upgrade the internal structure of the book , if possible. For instance, upgrades EPUB2 books to EPUB3 books". That sounded harmless to me.
FBReader states on its homepage, that it will has no plans to fully support EPUB3.
So my world is right again: I will look for an alternative to FBReader that understands EPUB3 and Kovid fixed the number format issue.
Calibre is not only a great program, but it also has a great support community.
Thanks again.
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