po: Fix a couple of typos in the French FTYPE usage message.

[Francois Gouget]

---

I don't think 'ouverture' should be in the plural form in this context. 
I'm somewhat comforted in this by a Google search on "commandes d'ouverture".


 po/fr.po |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
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