Just so you know...
when I translate articles or such and just cite the source by abbreviation, I always save the sources as a "hidden annotation" to myself associated to the main post, using this technique https://soc.ialis.me/@b9AcE/100895152543707512 that I found, so if you really want to have the original language sources, I'll have them if you just reply to the post in question (so I can find it)... unless I failed to follow my method of course.
@b9AcE it's a pretty handy feature. Also to just have a private discussion/notification about a thread.
@jasper Yep. Much better than birdsite's old concept of having DMs separate from all other posts, for no good reason I can think of.