The headline pretty much tells everything: Nintendo DS flashcards, used to run homebrew but also backups, can not go on sale in France anymore. More information in French language can be obtained by clicking the link below.
Thanks to http://www.nintendomax.com/viewtopic.php?t=13910&f=19 for the news.
Source
This article is over 2 years old — the linked page may have changed, moved, or been taken over since then.