10beta1 is scheduled in about 2 weeks, so perhaps you could have something ready for that. I' curious if we handle the right-to-left direction properly.
I tested on Debian 8 installed with Hebrew locale. Added "he" to nls.nk file.
Worked as expected in mlterm.
-- Peter Eisentraut http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services