AHMM: Alfred Hitchcock's Mystery Magazine
EQMM: Ellery Queene's Mystery Magazine
The two top-ranked monthly publications of short mystery fiction. In the U.S. -- though I think they may exist in European countries also. At any rate, they always want translation rights when they buy a story.
This month's newsletter from Sleuth of Baker Street Books in Toronto has an ad for my books. The newsletter just went out, so I'll let you know how it goes.