Umschalten, and switch.

It might be the craziest little thing, but the new Apple Mail
client does multilingual spellchecking, which means, that I can just switch the language somewhere in the middle of a sentence, and it just reminds me of better spelling in this particular language, hmm... as long as it is not Polish, strange. (Wirklich, wenn ich einfach mittendrin ins Deutsche umschalte, dann hält die liebe Software mit.) I like this little helper quite a lot. Still looking for that Jaguar pocket protector.