This is the server-side of the SiLaTra System. This system is targetted towards the hearing and speech impaired community that use sign language for communicating with each other. But when they communicate with other people outside this community, there is a communication gap. This system is an attempt towards bridging this gap.
In the previous automata, a case like:
Up->Down->Sun_Up->ThumbsUp->Down->Up
Would still be considered as 'All the best'.
This has been fixed in the merge,