Sorry jmchauvel, but ther are somme issues in your translation

As I see you also have some typo:
COMMENT_TEXT_COMMENT_HAS_BEEN_DELETED=Ce commentaire a été supprimé par l'dministrateur
Seems you've missed 'a' in l'administrateur

One more question (regarding your notes about USER_FEED_TITLE translation. Current translation has such strings:
OBJECT_FEED_DESCRIPTION=Commentaires pour %s
OBJECT_FEED_ITEM_TITLE=%s A écrit :
SITE_FEED_TITLE=Commentaires
SITE_FEED_DESCRIPTION=Commentaires pour %s
SITE_FEED_ITEM_DESCRIPTION=%s A écrit : "%s"
for
OBJECT_FEED_DESCRIPTION=Discuss %s
OBJECT_FEED_ITEM_TITLE=%s says:
SITE_FEED_TITLE=Comments
SITE_FEED_DESCRIPTION=Discuss %s
SITE_FEED_ITEM_DESCRIPTION=%s says: "%s"
These strings are used as RSS feed title and description...