
While it's true that the Echo has that effect, there's nothing in the game itself suggesting there are multiple languages being used in the different Eorzean city states. There are no mentions about the Ala Mhigan, Gridanian, Ishgardian or any other language in any NPC dialogue or quest. If such a barrier existed (and language barriers are a pretty big deal), then you'd think it would be mentioned plainly somewhere. But nobody does. The simpler answers are the most probable: if no NPC mentions the difference in regional languages, the most likely answer is that they don't exist at all.
I wonder if anyone has asked in the official lore forums about this, and if they got any official answer. (<- is lazy)
I wonder if anyone has asked in the official lore forums about this, and if they got any official answer. (<- is lazy)