Hi Günter, I now also stumbled over polyglossia and babel support for Friulan: http://www.ctan.org/tex-archive/macros/latex/contrib/babel-contrib/friulan (http://en.wikipedia.org/wiki/Friulan)
Adding support for this is technically as simple as e.g. for Galician. What do you think, should LyX support this Italian dialect. I am unsure about our policy here, because it is not an "official" language.
thanks and regards Uwe
