i18n(calendar): translate 'h/zi', matrix howto, load legend, day-count word

- Post/mechanic meta 'h/zi' → __('h/zi') so RU shows 'ч/день', EN 'h/day'
- Wrap the 3 load-legend labels (0–5h/10, 5–8.5h/10, ≥9h/10) so 'h' → 'ч' on RU
- Split the long howto sentence so 'Pod'/'Mecanic' + 'Zile' translate
- Default fallback 'Pod 1 (default)' now uses __('Pod') + __('implicit')

Adds 5 new translations. Post NAMES themselves are DB rows (user data)
and are shown as-is — they're not translated by the app.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

lang/en.json

@@ -21,11 +21,13 @@
   "/api/v1/vehicles": "/api/v1/vehicles",
   "/api/v1/work-orders": "/api/v1/work-orders",
   "0 = dezactivat": "0 = dezactivat",
+  "0–5h/10": "0–5h/10",
   "1.15 = +15% peste prețul de bază. 0.95 = -5%.": "1.15 = +15% over base price. 0.95 = -5%.",
   "123456:ABC-XYZ...": "123456:ABC-XYZ...",
   "2FA": "2FA",
   "2FA dezactivat.": "2FA dezactivat.",
   "2FA resetat": "2FA resetat",
+  "5–8.5h/10": "5–8.5h/10",
   "> 0 calculează automat prețul client.": "> 0 auto-calculates client price.",
   "A1-03": "A1-03",
   "AGRNMD2X": "AGRNMD2X",
@@ -599,6 +601,7 @@
   "Done": "Done",
   "Downgrade": "Downgrade",
   "Draft": "Draft",
+  "Drag-and-drop între celule pentru a reprograma. Indicator de încărcare pe fiecare celulă (ore planificate / capacitate). Click pe celulă goală → programare rapidă. Click pe eveniment → detalii.": "Drag-and-drop between cells to reschedule. Load indicator per cell (scheduled hours / capacity). Click empty cell → quick appointment. Click event → details.",
   "Drept": "Permission",
   "Drepturi": "Permissions",
   "Due at": "Due date",
@@ -1969,6 +1972,8 @@
   "google": "Google",
   "h norm": "h norm",
   "h real": "h real",
+  "h/zi": "h/day",
+  "implicit": "default",
   "instagram": "Instagram",
   "jurnal": "log",
   "la fiecare request": "la fiecare request",