Improve french translation

Signed-off-by: pieterg <pieterg@users.sourceforge.net>
GetEcmInfo: Avoid that ecm has the value None

As this could lead to a GSOD in the Softcam Manager
http://openpli.org/forums/topic/33587-gsod-when-i-go-to-the-softcamsetup/page-2
Merge remote-tracking branch 'OpenPLI/master'

* OpenPLI/master:
  GetEcmInfo: Avoid that ecm has the value None
  Improve french translation