Add RBF fee bumping for unconfirmed sends

- Signal opt-in RBF (BIP125, sequence 0xfffffffd) on all new sends so
  they're replaceable.
- "Bump fee" on an unconfirmed sent tx (its detail view): rebuilds the
  same inputs + recipient outputs at the Priority rate, taking the extra
  fee from the change output (pulling in a confirmed coin if change can't
  cover it), re-signs, and routes to a "Replace with a higher fee?"
  confirmation showing old → new fee before broadcasting.
- New keys translated into all 19 locales.

Honest scope: P2A/TRUC/package-relay are L2/pre-signed-tx + node-relay
features that don't apply to a single-sig wallet broadcasting single txs
via public explorers, so they're intentionally out. CPFP (for receives /
unbumpable sends) is a possible follow-up.

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

1 files changed, 4 insertions, 1 deletions

diff --git a/src/locales/de.json b/src/locales/de.json
index 9e44612..3a59f78 100644
--- a/src/locales/de.json
+++ b/src/locales/de.json
@@ -141,5 +141,8 @@
   "copy": "Kopieren",
   "switchUnit": "BTC / sats wechseln",
   "footerMadeBy": "gemacht von",
-  "footerSourceOn": "Quellcode auf"
+  "footerSourceOn": "Quellcode auf",
+  "bumpFee": "Gebühr erhöhen",
+  "bumpConfirm": "Mit höherer Gebühr ersetzen?",
+  "replaceTx": "Ersetzen"
 }
\ No newline at end of file