Thanks a lot for the feedback! We are digging through and turning it into a list of items to explore changes or fixes for. I can’t guarrantee we will cover all of it, but we will aim to have a range of this addressed over the weeks to come.
Re Translate - We are currently experimenting with enabling a Discourse translate plugin. We are looking into how well it handles things.
The theme switching is an annoying one and one we are aware of. At its core this is one large forum, with multiple modes, one per application. That way we can work towards having topics be shared across applications, for example UE material editor topics are also relevant for UEFN. The downside is that we do see that the site sometimes gets it wrong and puts you into the wrong mode. I have asked my colleagues to try and work out some repro cases and take a further look at it.