Crash due to typo introduced by Weblate made me realize I wasn't running
the script that ensures translated strings have the same set of format
specifiers as the English -- which might not be strictly necessary, but
it's safer to enforce it for now. Moved a few remaining %s to %1$s style
while at it.
I modified existing translated strings, adding the new clause. Not doing
that would cause the existing strings to be stripped because they'd no
longer have the matching set of format specifiers.
When those became an advanced feature I added a warning for upgrading
players who'd miss them. That was long ago, and the warning was only
supposed to last a release or two.
