(Coming at this from English Wikipedia.)
The special flags that are shown on watchlist and recent changes (r, N, m, b, !, D) are rendered with tooltips, and with a legend box. For the other flags, the tooltips are rendered with source message (e.g.), whereas the legend box shows the local MediaWiki message (e.g.).
Previously it contained a wikilink, which was removed per T98703. Now the tooltips is rendering html codes. So we have
Edit made at Wiki<span style="text-decoration: underline;">d</span>ata
Is there any way of fixing this so the legend box still has the markups, but not when the message is showed as a tooltips?