feat(i18n): Tab-Buttons und Card-Titel der Lage-Ansicht lokalisieren

7 Tab-Buttons (Neueste Entwicklungen, Lagebild, Ereignis-Timeline,
Geografische Verteilung, Faktencheck, Analysepipeline, Quellenuebersicht)
sowie 6 Card-Titel + Map-Fullscreen-Titel bekommen data-i18n. Neue
Keys tab.* und card.* in de.json + en.json. Cache-Buster app.js
auf v=20260513e gebumpt.

src/static/i18n/en.json

@@ -41,6 +41,18 @@
   "tile.timeline": "Timeline",
   "tile.map": "Map",
   "tile.sources": "Sources",
+  "tab.latest_developments": "Latest developments",
+  "tab.summary": "Briefing",
+  "tab.timeline": "Event timeline",
+  "tab.map": "Geographic distribution",
+  "tab.factcheck": "Fact check",
+  "tab.pipeline": "Analysis pipeline",
+  "tab.sources_overview": "Sources overview",
+  "card.summary": "Briefing",
+  "card.timeline": "Event timeline",
+  "card.map": "Geographic distribution",
+  "card.pipeline": "Analysis pipeline",
+  "card.sources_overview": "Sources overview",
   "fc.label.confirmed": "Confirmed by multiple sources",
   "fc.label.unconfirmed": "Not independently confirmed",
   "fc.label.contradicted": "Contradicted",