Backtranslating capitals AA's

[jrbowden]

In UEB, any word written fully capitalized is terminated by a non-alphabetic sign, see Rules of Unified English Braille 8.4.2.

Thus: AA's should be written in UEB as ⠠⠠⠁⠁⠄⠎ AA'S should be wrriten in UEB as ⠠⠠⠁⠁⠄⠠⠎

Currently, backtranslating, Liblouis outputs: (incorrect:) ⠠⠠⠁⠁⠄⠎ AA'S

Test: - [AA's, ⠠⠠⠁⠁⠄⠎, xfail: backtranslation fails]

There are many examples in en-ueb-g2-dictionary_harness.yaml

How can you specify that after a non-alphabetic, the capital word is terminated?