If I rember correctly, Sasha was speaking a very corrupted form of Mandalorian, because Revan understood Mandalorian. Also, there was a Mandalorian imprisioned at the Sith Academy, who refused to speak anything but Mandalorian to your PC. So yes, they have their own Language.
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I understand that those characters were supposed to be speaking Mandalorian as far as the storyline goes. I was just pointing out that the same audio file was used and so it just sounded the same.