Just noticed this: https://phabricator.wikimedia.org/T105123. Related Aromanian ("roa-rup"/"rup") shows "armãneashti", this means Aromanian and is accurate. But "ruq" and "ruq-latn" produce "Vlăheşte". There are two issues here. Firstly the word shouldn't be capitalized, like Aromanian and unlike English, it is a Romance language and they don't capitalize demonyms and language names. Secondly, ş is a Turkish diacritic ([https://en.wikipedia.org/wiki/%C5%9E]). The appropriate one here would be ș. The reason why we have the Turkish one right now must be this: https://en.wikipedia.org/wiki/%C8%98#Unicode_support. However, it is time to correct it. "ruq" (and "ruq-latn", if not deleted) should produce "vlăhește" instead. "ruq-cyrl" currently produces "Влахесте" and it should be "влахесте", again only if not deleted. I don't know if "ruq-grek" produces anything. Please help me correct this. Thank you a lot.

It has been added, thank you! My only issue is that the hyphen has not been included (I think it was already like this, as the language was not missing from all code of MediaWiki). Thus, instead of "Istro-Romanian", "Istro Romanian" shows up. I have opened another task (https://phabricator.wikimedia.org/T357981), maybe it could be done at the same time?

This is what I mean. Putting the parameter "|language=ruo" produces "(in ruo)" instead of "(in Istro-Romanian)" as you can see on reference number 50 on this English Wikipedia article [https://en.wikipedia.org/w/index.php?diff=1171829642&oldid=1168374394&title=Istro-Romanians] (ignore the publisher/magazine thing). However, if I change the value on the parameter to for example "=ro" [https://en.wikipedia.org/w/index.php?diff=1171829664&oldid=1171829642&title=Istro-Romanians], it produces "(in Romanian)" without any issue. That means a certain something includes Romanian but not Istro-Romanian in its code, I assume.