I had to read this discussion again...
In summary, there is NO recorded version of "Chanson d'O" with lyrics.
According to some forum's members, we can find some lyrics:
(1) on a German site dedicated to Francoise
http://www.fhardy.de/html/songtexte.html (--> select "chanson d'O")
(2) on a musical partition from the seventies (seems so..)
But according to a last member, Francoise confirmed she had never recorded it with lyrics. Final point.
Hope it will help you!
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"Und so singen wir die ganze Nacht, unsere Lieblingslieder, Lieder von früher..."