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Jorge, check the Creative Commons licence page for details, but as a summary: YES, you are allowed to translate it, with the following restrictions:

1. You must acknowledge the source (ie. it's still Parent's book, not yours :)
2. Non-commercial only, so you cannot sell it (I'm not sure or selling without profit is allowed)
3. Your translation must remain under the same licence

If you translate, it is probably wise to update nomenclature and add notes on taxonomic changes. Perhaps such translations could be made in a collaborative way, using a Wiki for example.