8a41b37fa1
Two t!() call sites referenced keys that do not exist in any locale file, so
the dotted key rendered verbatim in the UI:
- goblin.receipt.copied -> goblin.receive.copied (the shared "Copied" flash)
- wallets.canceled -> wallets.tx_canceled (the existing tx status)
Both now point at keys already translated in all six locales.
Adds every_t_call_site_key_exists_in_en: extracts t!("literal") keys from
src/ and asserts each resolves in en.yml. The existing drift test only compares
locale files to each other and cannot see a call site typing a missing key.