fix LFUN_LANGUAGE bug, due to Font/Language separation

[Dov Feldstern]

Hi!

I committed a fix to a bug due to the Font/Language separation, which 
was causing LFUN_LANGUAGE to not work 
(http://www.lyx.org/trac/changeset/21305).

This solution may be a bit of a hack --- I'm not familiar enough with 
the bigger picture. Perhaps a better solution would be to further 
separate between Font and Language, by changing toggleFree to deal with 
them in a totally separate manner, or even to have separate functions 
for the language and font. If anyone feels like looking into this, feel 
free.

Dov