Special:Translate scrolls the page to a random position
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Fragment of a discussion from Translation UX feedback
The problem is the next mensage isn't even visible in that area of the page where I get after clicking "Save" (so I have to scroll manually after every save).
1366x768 (16:9)
Helder, I suspect that without some further debugging/steps to reproduce provided from your side this will hardly ever progress.
I reported the problem on bugzilla:52245 and added a screencast showing what happens.