If anything given that languages and words in them can change over time as well be being influenced by other languages around them Dalish would likely sound like counterdicting gibberish to any one who did speak the Arlathan tongue. That's without going into the fact of different dialects of the language and that Arlathan might have had for all we know a separate language for the ruling class.
that reminds of a thought i had, we know solas doesn't know everything and i got to thinking, for slaves to walk in temples and what not........... what if solas is both right and wrong.
what if from his perspective the dalish facial markings are nothing more then slave markings.
but we know from what solas said the "gods" forced their slaves to fight for them do this do that.
what if the slaves really didn't view their relationship as slavery, what if serving the god's was an honour that the markings really were a point of pride? (like how in stargate people are full on devout to their masters believe them gods and happily die for them, despite the snake things not giving a damn about any of them)
what if the real reason that solas says "they are not my people" is that the dalish are actually descendant mostly from ancient elf slaves?
this is why they got so many things wrong they didn't just loose knowledge its knowledge they never really had, just stories told to them from the perspective of believing their leaders were gods.
and bits and pieces they picked up from ruins that combined their old slave culture with that of the ancient elves. what if solas and his people really were SOB's?