hunspell-1.3.2-r3 installs these items on my system which has LINGUAS="en_GB en cs sk ja":
*** Bug 481618 has been marked as a duplicate of this bug. ***
I'm proxy-maintainer of this package for the time being. I have talked to other developers and it seems recent policy is to leave small text files like this alone. However, I will ask around when I have more time. In the meantime this bug should be assigned to me.
I won't add USE flags for controlling the installation of one file per USE, also, as explained in:
that doesn't seem the way to go (probably install_mask would be the best)