Found while classifying the remainder rather than by the gate pointing at them:
the search box's aria-label was hardcoded English — screen-reader text, the same
class as the resize-handle bug that check:i18n-keys-exist documents — along with
the legend's open/close label, the three gap-chart titles, "unnamed language",
the unchecked-link notice, and "no code", which appears at six call sites and is
now one key.
Nine keys, sixteen call sites. 102 -> 88.
These were hiding inside the 102 I had described as mostly-deliberate. The
classification was worth doing for its own sake: four of the five classes really
are deliberate, but the fifth had real defects in it, and I would not have found
them by reading the count.