v0.317.0: a second copy counts only on a proven different disk; the no-drive install speaks in words (felhom.eu architecture/16, build A)

Tier-2 and the one-copy notice ask the host agent (POST /disks/same-disk, agent 0.157.0): different +
proven -> made and counted; same disk -> not made (D1); unknown (VM, hidden USB serial) -> made, not
counted, the row says why (D2); a NAS never counts and no longer hides the notice (R-1075). An older
agent keeps the st_dev rule, logged once. D4: a data-folder or media app on a box with no drive is
refused in words with a link to the drives page (R-1068's raw-error half). MinAgent 0.157.0.

Claude-Session: https://claude.ai/code/session_012qRErfCoiTkvDK9N5XHbzb

controller/scripts/i18n_go_keys.json

@@ -250,7 +250,11 @@
     "app_page.tab_logs": "BORN AS A KEY (v0.315.0, 2026-10-15) -- the „Naplo\" tab's label. The logs PAGE said „Naplok\" (plural); the tab is one app's log, so the word is new, not moved.",
     "err.after_start.failed": "BORN AS A KEY (v0.315.0, 2026-10-15) -- the generic refusal for an after-start action that fails without naming its own sentence. Plex's three messages (err.plex_claim.*) are unchanged; this is the fallback a future app gets for free.",
     "page.title.app_data": "BORN AS A KEY (v0.315.0, 2026-10-15) -- the data tab's page title. It replaces page.title.tier2_config, whose page no longer exists; the old key was removed in the same commit.",
-    "page.title.app_guide": "BORN AS A KEY (v0.315.0, 2026-10-15) -- the guide tab's page title. New: the details page it replaces had no title key of its own, it used the app's display name."
+    "page.title.app_guide": "BORN AS A KEY (v0.315.0, 2026-10-15) -- the guide tab's page title. New: the details page it replaces had no title key of its own, it used the app's display name.",
+    "note.backup.single_copy": "BORN AS A KEY (v0.317.0, 2026-10-15) -- the one-copy notice on the backup page (felhom.eu architecture/16-storage-physical-identity.md §4). It replaces the Go constant singleCopyNotice, removed in the same commit; the wording changed ON PURPOSE (the informal voice, R-1072; the honest same-disk sentence, `16` D1).",
+    "note.backup.single_copy_unproven": "BORN AS A KEY (v0.317.0, 2026-10-15) -- the notice when a second drive exists whose disk the host agent cannot prove (a VM, a USB bridge that hides the serial; `16` D2). New.",
+    "backup.tier2.unproven": "BORN AS A KEY (v0.317.0, 2026-10-15) -- the app row's line under a Tier-2 copy on a drive the agent cannot prove is another disk (`16` D2). New.",
+    "err.stacks.needs_drive": "BORN AS A KEY (v0.317.0, 2026-10-15) -- the install refusal on a box with no drive (`16` §5, D4; R-1068). New; it never names the field."
   },
   "flash.share.already_on": "A megosztás már be van kapcsolva.",
   "flash.share.enable_failed": "A megosztás bekapcsolása nem sikerült.",