He is trying to identify the words in a foreign language used in a book predominately in English. From what I understand, using span tag instead of an italic would probably be better, but FlightCrew checks epub2 not epub2.1 so the language attribute lang= is not recognized by Flightcrew but is now legal! The attribute xml:lang= is a recognized attribute by FlightCrew. That is why most books tell you to use both attributes.
I would check this with Doitsu's epubcheck plugin. It is probably all okay. If it passes epubcheck, I would ignore it in FlightCrew as adding the lang= attribute came after Flightcrew was designed.
KevinH
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