I just wonder which lamguage description is missing for Multilingual Wikisource. :)
I noticed the other day that there are a bunch of Wikisources whose Wikidata items don't have labels in the languages of those Wikisources.
So if anyone knows how to write "Welsh Wikisource" in Welsh, it'd be great if you could go to Q24577651 and add the Welsh label. Similarly for the rest of these:
wd:Q18198097 Multilingual Wikisource