Let a weather source describe its own products

A weather source can describe its own products (credit, units, coverage,
legend) through an optional `display` object in each product manifest:
source, credit, units, coverage, info, legend and extent. The weather
layer uses each valid field in the row summary, legend, info text,
coverage navigation, outside-coverage status, layer stats and imagery
credit, and keeps today's built-in value for any field that is absent or
invalid. Units and legend describe one scale, so they apply only as a
valid pair; otherwise both keep their built-in values, and the radar
info heading names the units in use.

Text is single-line and length-capped. It rejects control characters
(U+0000-U+001F, U+007F-U+009F), line and paragraph separators, and
invisible or format characters: soft hyphen (U+00AD), combining grapheme
joiner (U+034F), Arabic letter mark (U+061C), Mongolian vowel separator
(U+180E), zero-width and direction marks (U+200B-U+200F), bidi embedding
and override (U+202A-U+202E), word joiner, invisible operators and bidi
isolates (U+2060-U+2069), variation selectors (U+FE00-U+FE0F), the
byte-order mark (U+FEFF) and tag characters (U+E0000-U+E007F).

Legends need 2-16 stops whose labels are plain decimal numbers or short
text and whose colours are #rrggbb. A number label must read back
exactly as the legend shows it: within the safe integer range, with no
leading zeros and no digits lost to rounding. Extents must be finite, in
range and non-empty. Supplied source and units text is data: the layer
marks it so the panels show it untranslated, while built-in values are
translated as before.

The imagery credit is escaped as plain text and follows a refreshed
manifest even when the shown frame stays the same. A refresh changes
only the credit: the shown frame keeps the snapshot it was staged from,
so a later host switch restages it with its own time and bounds and the
refreshed credit. Manifests without `display`, including the bundled
nowCOAST ones, render exactly as before.

src/i18n/locales/de.json

@@ -1759,6 +1759,8 @@
   "Contiguous US · gaps ≠ no rain": "USA ohne Alaska/Hawaii · Lücken ≠ kein Regen",
   "Americas + Pacific · not individual strikes": "Amerika + Pazifik · keine Einzelblitze",
   "Color: strikes/km²/min ×10³": "Farbe: Blitze/km²/min ×10³",
+  "Color: {units}": "Farbe: {units}",
+  "RADAR · {units}": "RADAR · {units}",
   "60°S–60°N · typically 2–3 h delayed": "60°S–60°N · meist 2–3 h verzögert",
   "North America · infrared imagery": "Nordamerika · Infrarotbilder",
   "Reduced motion · history playback unavailable": "Reduzierte Bewegung · Verlaufswiedergabe nicht verfügbar",

src/i18n/locales/es.json

@@ -1260,6 +1260,8 @@
   "Contiguous US · gaps ≠ no rain": "EE. UU. contiguos · huecos ≠ sin lluvia",
   "Americas + Pacific · not individual strikes": "América + Pacífico · no son rayos individuales",
   "Color: strikes/km²/min ×10³": "Color: rayos/km²/min ×10³",
+  "Color: {units}": "Color: {units}",
+  "RADAR · {units}": "RADAR · {units}",
   "60°S–60°N · typically 2–3 h delayed": "60°S–60°N · normalmente con 2–3 h de retraso",
   "North America · infrared imagery": "Norteamérica · imágenes infrarrojas",
   "Reduced motion · history playback unavailable": "Movimiento reducido · reproducción del historial no disponible",

src/i18n/locales/fr.json

@@ -1214,6 +1214,8 @@
   "Contiguous US · gaps ≠ no rain": "États-Unis contigus · lacunes ≠ absence de pluie",
   "Americas + Pacific · not individual strikes": "Amériques + Pacifique · pas des impacts individuels",
   "Color: strikes/km²/min ×10³": "Couleur : impacts/km²/min ×10³",
+  "Color: {units}": "Couleur : {units}",
+  "RADAR · {units}": "RADAR · {units}",
   "60°S–60°N · typically 2–3 h delayed": "60°S–60°N · retard habituel de 2 à 3 h",
   "North America · infrared imagery": "Amérique du Nord · imagerie infrarouge",
   "Reduced motion · history playback unavailable": "Animations réduites · lecture de l'historique indisponible",

src/i18n/locales/it.json

@@ -1214,6 +1214,8 @@
   "Contiguous US · gaps ≠ no rain": "USA contigui · lacune ≠ assenza di pioggia",
   "Americas + Pacific · not individual strikes": "Americhe + Pacifico · non singoli fulmini",
   "Color: strikes/km²/min ×10³": "Colore: fulmini/km²/min ×10³",
+  "Color: {units}": "Colore: {units}",
+  "RADAR · {units}": "RADAR · {units}",
   "60°S–60°N · typically 2–3 h delayed": "60°S–60°N · di solito 2–3 h di ritardo",
   "North America · infrared imagery": "Nord America · immagini all'infrarosso",
   "Reduced motion · history playback unavailable": "Movimento ridotto · riproduzione dello storico non disponibile",

src/i18n/locales/ja.json

@@ -1182,6 +1182,8 @@
   "Contiguous US · gaps ≠ no rain": "米国本土 · 欠測 ≠ 降水なし",
   "Americas + Pacific · not individual strikes": "南北アメリカ + 太平洋 · 個々の落雷ではありません",
   "Color: strikes/km²/min ×10³": "色：落雷数/km²/分 ×10³",
+  "Color: {units}": "色：{units}",
+  "RADAR · {units}": "レーダー · {units}",
   "60°S–60°N · typically 2–3 h delayed": "60°S–60°N · 通常2–3時間遅れ",
   "North America · infrared imagery": "北米 · 赤外画像",
   "Reduced motion · history playback unavailable": "動きを減らす設定 · 履歴再生は利用不可",

src/i18n/locales/pt.json

@@ -1212,6 +1212,8 @@
   "Contiguous US · gaps ≠ no rain": "EUA contíguos · lacunas ≠ sem chuva",
   "Americas + Pacific · not individual strikes": "Américas + Pacífico · não são raios individuais",
   "Color: strikes/km²/min ×10³": "Cor: raios/km²/min ×10³",
+  "Color: {units}": "Cor: {units}",
+  "RADAR · {units}": "RADAR · {units}",
   "60°S–60°N · typically 2–3 h delayed": "60°S–60°N · normalmente com 2–3 h de atraso",
   "North America · infrared imagery": "América do Norte · imagens infravermelhas",
   "Reduced motion · history playback unavailable": "Movimento reduzido · reprodução do histórico indisponível",

src/i18n/locales/ru.json

@@ -1278,6 +1278,8 @@
   "Contiguous US · gaps ≠ no rain": "Континентальные США · пробелы ≠ нет дождя",
   "Americas + Pacific · not individual strikes": "Америка + Тихий океан · не отдельные разряды",
   "Color: strikes/km²/min ×10³": "Цвет: разрядов/км²/мин ×10³",
+  "Color: {units}": "Цвет: {units}",
+  "RADAR · {units}": "РАДАР · {units}",
   "60°S–60°N · typically 2–3 h delayed": "60° ю. ш.–60° с. ш. · обычно задержка 2–3 ч",
   "North America · infrared imagery": "Северная Америка · ИК-снимки",
   "Reduced motion · history playback unavailable": "Уменьшение движения · воспроизведение истории недоступно",

src/i18n/locales/uk.json

@@ -1229,6 +1229,8 @@
   "Contiguous US · gaps ≠ no rain": "48 суміжних штатів США · прогалини ≠ немає дощу",
   "Americas + Pacific · not individual strikes": "Америка + Тихий океан · не окремі розряди",
   "Color: strikes/km²/min ×10³": "Колір: розрядів/км²/хв ×10³",
+  "Color: {units}": "Колір: {units}",
+  "RADAR · {units}": "РАДАР · {units}",
   "60°S–60°N · typically 2–3 h delayed": "60° пд. ш.–60° пн. ш. · зазвичай затримка 2–3 год",
   "North America · infrared imagery": "Північна Америка · ІЧ-знімки",
   "Reduced motion · history playback unavailable": "Зменшення руху · відтворення історії недоступне",

src/i18n/locales/zh-CN.json

@@ -1156,6 +1156,8 @@
   "Contiguous US · gaps ≠ no rain": "美国本土 · 数据缺失 ≠ 无降雨",
   "Americas + Pacific · not individual strikes": "美洲与太平洋 · 非单次闪击",
   "Color: strikes/km²/min ×10³": "颜色：闪击次数/km²/分钟 ×10³",
+  "Color: {units}": "颜色：{units}",
+  "RADAR · {units}": "雷达 · {units}",
   "60°S–60°N · typically 2–3 h delayed": "60°S–60°N · 通常延迟 2–3 小时",
   "North America · infrared imagery": "北美洲 · 红外影像",
   "Reduced motion · history playback unavailable": "减弱动效 · 历史回放不可用",

src/i18n/locales/zh-Hant.json

@@ -1151,6 +1151,8 @@
   "Contiguous US · gaps ≠ no rain": "美國本土 · 數據缺失 ≠ 無降雨",
   "Americas + Pacific · not individual strikes": "美洲與太平洋 · 非單次閃擊",
   "Color: strikes/km²/min ×10³": "顏色：閃擊次數/km²/分鐘 ×10³",
+  "Color: {units}": "顏色：{units}",
+  "RADAR · {units}": "雷達 · {units}",
   "60°S–60°N · typically 2–3 h delayed": "60°S–60°N · 通常延遲 2–3 小時",
   "North America · infrared imagery": "北美洲 · 紅外影像",
   "Reduced motion · history playback unavailable": "減弱動效 · 歷史回放不可用",