v0.277.0: kept data loads from the off-site copy too (R-691 (2))

Use my kept data / Load consider the off-site snapshot when it is newer than every local copy or
the only one; the unit is downloaded alone, judged (drive, data, recorded data version) and only
then restored. The page names the copy and its date.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0159rPz1ZhFKsS53msqPYxtS

controller/internal/i18n/locales/en.json

@@ -2441,6 +2441,10 @@
   "kept.backup.second": "the second drive, %s",
   "kept.backup.with": "the backup kept with it, %s",
   "kept.backup.none": "no backup — the files only",
+  "kept.backup.offsite": "the off-site copy, %s",
+  "kept.choice.use.desc_from": "We load the database from %s and start the app with the old files. Changes made after that time can be missing.",
+  "err.kept.offsite_version_unknown": "the off-site copy of %s does not record which version wrote its data, so it is not loaded",
+  "err.kept.offsite_not_usable": "the off-site copy of %s does not belong to these files (it was taken of another drive, or it holds no database), so it is not loaded",
   "kept.action.load": "Load",
   "kept.action.look": "Look",
   "kept.action.delete": "Delete",