I didn't think this was a bug, but more like a typo, so I posted it here.
It's also not related to the bug where they just disappear, I'll just show pictures (put them in spoilers because they're kind of big):
The default quote for Wigfrid is correct, as there are umlauts there -
However, upon looking at the other skins of her, her quotes act like they do not have umlauts.
It's not noticeable with her Guest of Honor skin as there aren't any o's to umlaut in there. But take a look at Survivor.
Notice the o's? They don't have umlauts on them.
Same with her Triumphant.
It's not gamebreaking or anything; it's not even that important because it's only 1 screen of the entire game. I just thought it was interesting how I didn't notice this until now.