Added setting to set the WiFi mode (AP or Station)

This reverts commit 85af870c.

Got the new BAT_LOW_THR parameter.

During tests, if the airframe was configured to be an 'X' type
we showed just 'X' on the airframe type. It's correct but a
single letter - specially an X - made users think that it was
a error code, not the airframe name. So, because of that, also
show the vehicle type - a wrong value, but elucidative for users.

Signed-off-by: Tomaz Canabrava <tomaz.canabrava@intel.com>

Signed-off-by: Tomaz Canabrava <tomaz.canabrava@intel.com>

Signed-off-by: Tomaz Canabrava <tomaz.canabrava@intel.com>

all calls to qsTr are done, if I didn't forget anything,
on the PX4 QML files.

Signed-off-by: Tomaz Canabrava <tomaz.canabrava@intel.com>

Add support for localization in the QML's on the Common folder.

Signed-off-by: Tomaz Canabrava <tomaz.canabrava@intel.com>

Change all text to have a qsTr call, this way it will
call the right translated text when needed.

Signed-off-by: Tomaz Canabrava <tomaz.canabrava@intel.com>