Okay, until I can figure out something better here, I have pushed a fix that "allows" a blank or empty dc:language tag when invoking the MetaEditor to prevent crashes. This effectively returns it to act like Sigil-1.9.10 in that one respect.
A need to check the xml and epub specs in more detail to see what if any fallbacks should be employed if any.
This will prevent the Embedded Python Error.
@gmw
Thank you for your bug report!
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