Make the possibility of write Braille with output Braille tables

[Futyn-Maker]

Hello!

I write tests for my Liblouis tables with this add-on, it's very comfortable, thank You very much!
But my Braille table haven't the back translation (input) ability, so I can't simply generate Braille symbols with such tables as this add-on allows to work only with an input table. Of course, I can make replacement with renaming, but it's unconvinient. I suggest adding an opportunity to generate Braille using the output Braille table.

Thanks!