[done] Move book from "Unknown" author to J.M.G. Le Clézio

[Pawel]

Please move :
Podroz do krainy drzew
to
J.M.G. Le Clézio
and combine it with
Voyage au pays des arbres

Book data:
Title: Podróż do krainy drzew
Translator: Natalia Jaskuła
Publishing date: 2009

[Livietta]

Done.

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