Doesn't happen on v4.4.dev5.official [9e60984]

Bisecting seems to show the culprit is commit ff6eea5

What I think is happening is :

1. The project manager window is given a title at creation by directly going through the DisplayServer without using the Window node here)
2. The scene tree is initialized with everything.
3. Post "enter tree", commit ff6eea5 sends a NOTIFICATION_TRANSLATION_CHANGED to the nodes
4. The Window node receives the notification, and re-translates the title here. However, to do so it uses the title variable that has never been set. The title is thus empty, but since we're on a dev version (with DEBUG_ENABLED active), (Debug) is appened at the end of the empty string. Giving thus the wrong title.

I'm really not sure how to proceed to fix this, because by the time the title is first set, the Window node does not exist and so we cannot set the title variable properly.

Bisecting seems to show the culprit is commit ff6eea5

CC @AThousandShips

Then the older more extensive solution I had might have been required, this particular change can't really safely be reverted as it solves a pretty serious crash

Can't really work on a fix for that part right now, but it shouldn't be relying on that detail I think, so something else is likely wrong

CC @YeldhamDev

Some other changes must have happend to cause this particular problem as the translation update used to be in this part of the initialization process, so something else must have shifted to make this a problem, the title has to be updated correctly probably at an earlier phase

Ok, I think we can solve simply the problem. I'm sorry I made a mistake in my assessment: the root of the scene already exists when we give the title to the project manager initially. So we can give it a title instead of going directly to the DisplayServer. I'm testing a few more things and if that works I'll try to push a fix.