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The default language (or languages) are defined in the content.opf, making the need for lang or xml:lang on the html tag redundant. In pure standalone html files that are not part of an epub (i.e. without a content.opf), it is good practice to add those attributes for reading by assistive technologies. In epubs they are not required and it is up to the ebook developer to decide to add them or not.
If this is something you want, you can esily use a plugin like DiapDealers newest addition to add anything here you want or even a simple search and replace of the html tags.
KevinH
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