Well, I tend to believe that mentioning specific features that people will
like is more effective than saying "LyX can do almost everything almost
perfectly!" Mentioning specific languages might people who speak that language
to say "hey, a word processor [sic] that speaks my language. Why don't I try
to download it?" And then they're hooked. Whereas if you say "several
languages" they might not bother.
I can speak for a Hungarian only: mostly when I read "several
languages" I do not bother, b/c Hungarian is an obscure language, and
very rarely supported anywhere. On the other hand, when I see
"Hungarian", I press the download button.
Mate