Make gift Reclaim a real on-chain revoke

The old "Reclaim" only un-reserved the coin locally, so the gift link
stayed claimable. Replace it with "Revoke": a confirmed action that
sweeps the reserved coin back into the sender's own wallet at a high
fee (wallet.revokeGift), double-spending the gift's presigned input so
the link can't be claimed once it confirms. Races a simultaneous
claimer; if the gift was already claimed the broadcast just fails.
New strings translated across all 19 locales.

Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>

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