A Lightning payment that can't be covered says why, not 'Payment failed'

A user renewed all ten of their coins (55,611 sats) from the coins page,
tried to pay a 55,300-sat invoice three minutes later, and was told only
'Payment failed'. Nothing had failed: the renewal's round ran at once,
but its coins stay unspendable until the round's transaction confirms
on-chain, and that block took 64 minutes. The quote found no spendable
coin and gave up with the generic message; nothing reached the server.

- The quote now tells apart (lnShortfall): money held by another payment
  (wait, as before — now by sum, not one coin covering it all), money a
  renewal holds ('Nothing was sent. N sats are being renewed…'), and a
  real shortfall ('needs X sats with its fee, Y available'). Coins leaving
  in an offboard or exit are never waited for.
- The manager's 'insufficient ark balance' names a renewal too.
- The coins page says before the tap that renewed coins can't be spent
  until the round confirms, and that renewing every coin leaves nothing
  to pay with meanwhile.

tools/ark/ln-shortfall-test.js

Co-Authored-By: Claude Fable 5.1 <[email protected]>
Claude-Session: https://claude.ai/code/session_01ULQZS9MQa6iAsXnrJUD9Du

1 files changed, 4 insertions, 1 deletions

diff --git a/src/locales/ja.json b/src/locales/ja.json
index 56e05f4..3805d70 100644
--- a/src/locales/ja.json
+++ b/src/locales/ja.json
@@ -912,5 +912,8 @@
   "videoTapToPlay": "タップして再生",
   "videoLargeTitle": "動画",
   "videoLargeToggle": "大きな動画を自動再生",
-  "videoLargeHelp": "{mb} MBを超える動画や1080pを超える動画は、データを使いすぎないようタップするまで再生しません。低速回線やデータセーバー時は上限が下がります。"
+  "videoLargeHelp": "{mb} MBを超える動画や1080pを超える動画は、データを使いすぎないようタップするまで再生しません。低速回線やデータセーバー時は上限が下がります。",
+  "arkLnRenewing": "何も送金されていません。{sats} satsは更新中で、更新がビットコインネットワークで承認されるまで使えません（通常は約10分、1時間以上かかることもあります）。その後にもう一度お試しください。",
+  "arkLnShort": "残高が足りません。この支払いには手数料込みで{need} sats必要ですが、使えるのは{have} satsです。",
+  "arkCoinsRenewLock": "更新中のコインは、ラウンドのトランザクションがビットコインネットワークで承認されるまで使えません（通常は約10分、1時間以上かかることもあります）。すべてのコインを更新すると、その間は支払いに使えるものがなくなります。"
 }