Furry stuff, oekaki stuff, and other stuff.
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Ah, there was a missing variable. This will be fixed in the 1.5.7 update.
In the meantime, add the red line to your French language file in the "whosonline.php" section:
$lang['o_newpass'] = 'Change Password';
$lang['o_niftyusage'] = 'Using Niftytoo';
$lang['o_notebbs'] = 'NoteBBS';