To give you an idea of just how busy these translators are right now, here's an excerpt from the Part II article:

Although a five-month period has not been unusual for the most recent, very long volumes, there is often pressure from Warner Brothers to have the translations completed much more quickly. Jean-François Ménard, the French translator, translated the 700-plus page fourth book, Harry Potter and the Goblet of Fire, in just 63 days. Torstein Hoverstad negotiated a bonus percentage with his publisher if he was able to finish the same book in a similar two-month period. (He did.) And Hanna Lutzen and Victor Morozov each formulated plans to translate the even longer Book V, Harry Potter and the Order of the Phoenix, into Danish and Ukranian, respectively, in the same eight-to-ten week timeframe.