Add columns option to checkbox TV. It works as expected, but I don't know where I can add the 'radio_columns_desc' to give the input field a proper helptext.
[#7866] Add columns option to Checkbox TV

Merge remote-tracking branch 'pepebe/develop' into bug-7866

* pepebe/develop:
  Add columns option to checkbox TV. It works as expected, but I don't know where I can add the 'radio_columns_desc' to give the input field a proper helptext.