po: Use lowercase+underscore names for the replaceable parts of the French usage messages.

[Francois Gouget]

This brings consistency and this format keeps the spellchecker happy.

Signed-off-by: Francois Gouget <fgouget at free.fr>
---
 po/fr.po | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)
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