To reproduce, look at:
- https://translatewiki.net/wiki/User:Amire80?uselang=ru - scroll to the bottom and notice how the categories look like: "Категории!!FUZZY!!: User ru"
- https://translatewiki.net/w/i.php?title=Special:MessageGroupStats&language=he&group=ext-twnmainpage&uselang=ru - all the percent values appear as "!!FUZZY!!41%", etc.
The messages in question are [[ https://translatewiki.net/w/i.php?title=MediaWiki:Colon-separator/ru&action=history | Colon-separator ]] and [[ https://translatewiki.net/w/i.php?title=MediaWiki:Percent/ru&action=history | Percent ]]. Both are optional and don't need translation in Russian at all. They were unnecessarily translated and marked as FUZZY in June.
We can simply update or remove the translations, but there may be a deeper issue here. Looks like only now in November they became displayed in this broken way. I'm not sure why—it may be a problematic core change or something else.