I think (THINK) I've fixed the ones on exits and entrances, at least the default ones... any custom exit messages may still need fixing.
I'm in the process of writing something that will hopefully fix every seat in the game (sit/stand messages), but it'll need to be validated and run by FS as it'll automatically re-write all the current seating messages... which has potential to go horribly wrong.
So, I want you good folk to report bad capitalisation. Specifically, I need to know the full message you saw, where you saw it and what you or the person who generated the message did to trigger it.
(One exception, when in a vehicle, I'm not interested in any message you see that beings "Outside, ". There's no easy way to fix them because of the way they're passed into vehicles.)