It is compatible with OpenCart 2.3 and for Journal 2, but it can be in some parts it is not working yet.
OpenCart 3 I didn't checked it for support. So it can work because its changing text on a low level in OpenCart, but I am not sure. It is not yet on my planning to check the Journal 3 support.
When it is not working I can check it, but it can be that it will take some time to fix it because of my planning.