The sort option gives two options: Heading Ascendant Heading Descendant Which are striking in their weirdness. Ascending/Descending are more correct or should we go for something like 'Alphabetical' 'Reverse Alphabetical' (to avoid sounding too sql-ly)
In actual master, options are Heading A-Z and Heading Z-A. So you may close this bug.
Resolved Fixed in master