Some strings do not translate

Hi
I use the French language and some strings do not get translated. Specifically in single-product-reviews.php:
printf( _n( '%s review for %s%s%s', '%s reviews for %s%s%s', $count, 'woocommerce' ), $count, '<span>', get_the_title(), '</span>' );

and

sprintf( __( 'Be the first to review “%s”', 'woocommerce' )

I checked the .PO file and both strings and correctly translated in French. I even generated my own .MO file and uploaded it to /wp-content/languages/plugins/woocommerce-fr_FR.mo

Please note that this problem appeared only a few weeks ago. Before these strings were translated correctly.