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They appear to me to be quite well defined. The first means neither your html tag nor the body tag has an lang="en" (or whatever language the page is in). Unless multiple languages are used, this is not an error or even a warning as the epub metadata defines the lang for the book.
The second says you are using inline styles, in other words a style defined in a style attribute of a html tag. This is not an error or warning as it is completely legal but many epub developers do not like them and they prefer standalone stylesheets for all styles.
Neither of these matter in any way.
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