Yes, CoreRPG has languages built in. You can create languages for you campaign in the options screen. The dropdown in the chat window will then be populated with your campaign languages.
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Connect with one player name, take control of a character. Then connect with a different name, you shouldn't see that character being controlled by the "other" name.
I can access a sub-window using the "languages" button, from the options tab, but run into difficulty. I see a field where I can manually enter a language (Elven for example) and a corresponding drop down menu where I assume there are meant to be font choices. Unfortunately, there are no choices available. I have also tried placing the "Fantasy Language Fonts.ext" into my extensions folder, but do not see it as something I can pull into my gurps campaign.