Revert to previous red colors but do not use red color for text

[lafriks]

Revert red colors back introduced by #2778

But do not use red color for text on dark background anywhere

example:

[xoxys]

Thanks for looking into it again! I really like this approach. What do you think about creating a reusable error template similar to the warning one we have already?

[xoxys]

I like the idea to re-use the look of the Vue notifications, and we can also adjust the warning template to this looks, but I think creating an error template might make sense.

[lafriks]

@xoxys done

[xoxys]

Besides that, looks good to me.