[jbrooksuk]

I believe Montag was highlighted because that's the current day.

[garethadams]

In an English locale (as the rest of the UI suggests), "Montag" isn't a day at all, let alone the current day.

The incorrect text is a UI bug, certainly, but the underlying issue suggested in multiple places is, how can you distinguish between a negative action and an accent in apps where both of those are identified by the same colour?

[ygra]

UI language and locale can be two different things. It has been the same for me for years.