Update PO files

Update and proofread of the french translation

* Really change VLC_Get to VLC_VariableGet

* upgraded liveMedia

* modules/demux/mpeg/m4a.c: MPEG 4 audio demuxer using the MPEG 4 audio packetizer (obsoletes the aac demuxer).

* modules/stream_out/transcode.c: fixed subpictures overlaying when the audio-sync or fps options are used.

* src/video_output/vout_subpictures.c: a few fixes for subpictures positionning when scaling is active.

* modules/video_filter/logo.c: new --logo-position option (by default the logo is displayed on the top right)

"* modules/mux/wav.c: support for s16l as well as fl32 + multichannel audio (up to 5.1) + proper channels ordering."

in Platform:

* src/libvlc.c: use dameon() instead of fork() when available. It does some more things like reopening stdin/out/err to /dev/null which avoids screwing up the first sockets we open.