[luatex] MWE now failing with recent TeX Live update

[Arthur Reutenauer]

On Fri, Mar 18, 2016 at 01:46:38PM +0000, Arthur Reutenauer wrote:
>   I'll try to see if dumping that at the top of polyglossia.sty works.

  Sadly no.  The code from luababel.def fails when loading language.dat,
even though it is correctly installed and can (of course) be found by
kpsewhich.  Somehow I think I've seen that error somewhere; does anyone
have an idea why this happens?

	Best,

		Arthru