i18n(ja): translate the remaining strings and review #913

- Translate the 1,875 strings #913 did not cover (2,727 in all), for a
  tactical HUD: aviation, maritime, weather and imagery terms, counters
  next to numbers (機, 隻, 基, 件), year-first dates.
- Review the contributor entries: full-width punctuation （）：？ and …,
  no space between Japanese and Latin, one katakana form per term
  (ブラウザー, ビューアー), and fixes where the meaning was off:
  NO PLACE LEFT BEHIND, LEVEL (horizon), CURATED / RAW PRIOR (CCTV
  calibration), STALE (更新遅延, not 古い), rocket stage (段), SAR vessels,
  T minus, POWER UP.
- List the codes, units and product names that stay as in English.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

src/i18n/same-as-english.json

@@ -124,6 +124,57 @@
     "ΔN",
     "▲ {frp} MW"
   ],
+  "ja": [
+    "1090 MHz",
+    "978 MHz UAT",
+    "AIS: --",
+    "AIS: {name}",
+    "BRG {value}°",
+    "BRG —",
+    "CAL {value}",
+    "CAL · {badge}",
+    "CCTV",
+    "CH {index} / {total}",
+    "CRS {value}°",
+    "CRT",
+    "FLIR",
+    "FLT",
+    "FM MHZ",
+    "FOV",
+    "FOV {value}°",
+    "FT",
+    "GEO",
+    "HDG",
+    "HDG {value}°",
+    "Ironbow",
+    "Landsat 8/9",
+    "MSG/S",
+    "NVG",
+    "REC",
+    "S2 GhostMaps",
+    "SRC {value}",
+    "Sentinel-2",
+    "USB {rate} msg/s",
+    "WHOT/BHOT",
+    "dB",
+    "ft",
+    "hPa",
+    "km",
+    "km/h",
+    "kt",
+    "mph",
+    "{city} CCTV",
+    "{rate} msg/s",
+    "{source} HTTP {status}",
+    "{speed} kn",
+    "{type}  SPD: {speed}  HDG: {heading}",
+    "{value} KM",
+    "{value} KM/H",
+    "{value} KM/S",
+    "ΔE",
+    "ΔN",
+    "▲ {frp} MW"
+  ],
   "ru": [
     "AIS: --",
     "AIS: {name}",