DSP Manager : Add french translation

Patch set 1 : original commit
Patch set 2 : correction
Patch set 3 : correction
Patch set 4 : correction
Patch set 5 : correction 'DSP Manager' in help text
Patch set 6 : rebase
Patch set 7 : rebase and correction

Change-Id: Iccc333ed2080d37189a2f0fc588aecdb19f0efaf