New Crowdin updates

[paullinator]

Note

Low Risk
Localization-only JSON changes with no application logic; main review note is untranslated English strings in non-Italian locales until Crowdin catches up.

Overview
This PR pulls Crowdin updates into ten locale files (de, es, esMX, fr, it, ja, kaa, ko, pt, zh), adding the same new string keys everywhere so recently shipped UI can resolve copy.

The new keys cover startup/wallet health (boot_failed_message_1s, fragment_wallets_wallet_engine_failed_1s), balance privacy (unhide balance + toast), send flow (self-send error, zero-amount confirmation, broadcast unknown/failure messaging, slider “Send Attempted”, funds not spendable while syncing), sync UX (large_utxo_wallet_*), WalletConnect message signing (wc_sign_message_*), plugins/gift cards (plugins_unavailable_message_1s, gift_card_providers_unavailable), and a default Robinhood Chain wallet name.

For most locales the new entries are still English placeholders; it.json is the outlier, with full Italian translations for many of these keys plus additional copy updates (sign-message, Zcash Ironwood migration, staking reclaim, Monero server settings, clock skew, app shortcuts, and related strings).

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