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I found the following in the admin folder of the module in a file called banusers.php
"._MI_XOOPSCHAT__ADMENU3."
It shows a double underscore after _MI_XOOPSCHAT, just like hsalazar said.
I've modified the constants.php with the double underscore but it still doesn't work. Is there something I need to update after making the change? I tried to update the Module in the Module Administration but it didn't make a difference.
FYI - I'm only modifying the english language constant.php since I have other languages turned off.