Special:Translate scrolls the page to a random position
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Fragment of a discussion from Translation UX feedback
No, that's supposed to center the next message. IIRC to me the problem happens when there isn't enough space (TUX requires wide screens), but using 60 or 70 % zoom improves the situation.
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.