French language update. In bonus, few improvements and fixes by Clément Pit-Claudel (taken from FS#9141).
Remove an empty line from the english file, while I was here.


git-svn-id: svn://svn.rockbox.org/rockbox/trunk@18328 a1c6a512-1295-4272-9138-f99709370657
diff --git a/docs/CREDITS b/docs/CREDITS
index 56bbcd3..74f359c 100644
--- a/docs/CREDITS
+++ b/docs/CREDITS
@@ -410,6 +410,7 @@
 Tadayuki Nishizono
 Jun Gu
 Daniel Weck
+Clément Pit-Claudel
 
 The libmad team
 The wavpack team