lloc/Multisite-Language-Switcher — comment on commit 7ee90cc6c1b71fbb21574f3ef931ba5f6903913c
File:  line 0
By TobiasBg:

And now you even beat me with an explanation to it! :-)

Yes, that solution also sounds like a good idea, especially as it would allow users to customize these strings for languages for which a full *.po/*.po translation does not exist.