Add context support for translator

Change-Id: I448c44f9fbcf3a9e1cbb23e1b3dc36fba6f27e29
Reviewed-on: http://gerrit.aldebaran.lan/48495
Reviewed-by: pdaouadi <pdaouadi@aldebaran-robotics.com>
Approved: hcuche <hcuche@aldebaran-robotics.com>
Reviewed-by: hcuche <hcuche@aldebaran-robotics.com>
Tested-by: hcuche <hcuche@aldebaran-robotics.com>