settings: add big menu support back

some in our team as well user want it urgently so we do it for
now till new Slim recents is back then we handle it so or so in
another way and do not need the recents button anymore and can
use the big menu button as permanent and get rid off the smal
3dot completly,

Change-Id: I98bc1f0814398af5d7a5d26c28f7edce1c598957
settings: systemwide immersive mode aka expanded desktop

Change-Id: I6776a67404f616501c93ceb8249160980f24979e
string correction