Add missing translation strings for OSRM TBT instructions.

Open Source Routing Machine may return street names in more cases
than were previously covered. Also added missing roundabout cases
and corrected the spelling of 'roundabout'.

Change-Id: I01e5098ddcddcb92e04cd1d230e92c8fa7998f23
Reviewed-by: Alex Blasche <alexander.blasche@digia.com>