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Ah. I haven't seen any discussion on html5 sites rankings in search engines versus simliar html4 sites, so I can't really comment on whether removing those tags will negatively affect your rankings. But if you want to have the site validate as html5, I think the only answer is to remove them. The language one is as CD mentioned, though you might show what the top of your code looks like as I suspect you made a typo or something.
Dave
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