Actually that is a mistranslation.

In PC Search, if you edit your search info, the tooltip for the language tags say "languages available to the player" which really can be explained into anything we want. But a look at the Japanese version shows the true intent of the language tags:

対応可能な言語 = languages you can correspond in
The language tags are like a label that says, "hey, I can speak these languages!"

Obviously, there's no tooltip on the language tags for the Duty Finder, so I suppose people will argue that it's for a different purpose.

I'm not trying to prove anyone wrong or anything. Just pointing out something that many may have missed.