Unfortunately, hyphenation still did not work... Then, Kent West, in the debian-user mailing list, told me to install hyphenation packages directly from OpenOffice, and it worked! (Thank you Kent!)
I had never used such functionalities in OpenOffice, and they work great! I used the menu File->Wizards->Install Dictionaries and it does most of the work automatically, you just need to retrieve the list of available dictionaries and choose the one you want. Then, you'll find the corresponding dictionary in Options->Language Settings->Writing Aids.




You're welcome; glad to help.
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Kent West