Add input table to braille settings documentation and changed translation table to...

Add input table to braille settings documentation and changed translation table to output table.

* Expanded a bit the output table section: we have tables for many languages but also grades and "standards".
* In the braille input table section make clear the feature is only supported in devices with a braille keyboard (obvious but...) and if the driver supports it. Link the braille displays documentation for further details.