Every neighbouring string in the root help listing — service
descriptions, utility descriptions, global flag usage — is hardcoded
Chinese. Routing only the feedback label through i18n therefore rendered
it in English on any host whose LANG is not zh_*, leaving a lone English
line inside an otherwise Chinese screen.
Hardcode the label and drop the two locale entries it needed. A test
assertion now pins the Chinese label so the indirection cannot return
unnoticed.