This continues leftover work from #923 and #1097.

Both aria-brailleroledescriptions and aria-braillelabel contain the following complicated SHOULD NOT for authors:

The value of aria-brailleroledescription does not contain any characters in Unicode Braille Patterns (U+2800..U+28FF) or consists of only characters in Unicode Braille Patterns (U+2800..U+28FF) while not only containing Braille Pattern dots-0 (U+2800).

As discussed on the PRs and telcos, this sentence is complicated and duplicated, risking changes in only one copy.