I'm kinda lost.
As I get it first, there is system "you learinig language => you take "Linguistics (something)" skill. It can be exp consuming, but ok, Linguistics is int+general, so it's normal.
But later I noticed "Talents determine the languages a specific character knows, such as the Low Gothic of the masses, a feral world’s regional dialect, or even a xenos tongue." and "-30: Deciphering a completely alien language or understanding a language both unknown to the character and without any relationship to known languages. Deciphering a completely alien language or understanding
a language both unknown to the character and without any relationship to known languages."
So if I'm seeing it right, that's work such way. My character have "Linguistics (High Gothic)" and used to create poems. He takes ancient Eldar text, dating before Eye of Chaos opened. He roll his High Gothic with -30 and voila!
I belive it's silly a bit, isn't it? And what talents this text mentioning?