i18n: update translation keys for schema changes

Update translation keys to match new schema field names.

- Update contextWindow translation key (was totalContext)
- Keep display text as "Total Context" for user-facing labels
- Apply changes across all supported locales (en, de, ko, zh-Hans)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: ericyangpan

translations/de/pages/stacks.json

@@ -95,7 +95,7 @@
     "pricing": "Preise",
     "specifications": "Spezifikationen",
     "stars": "@:components.productHero.stars",
-    "totalContext": "Gesamtkontext",
+    "contextWindow": "Gesamtkontext",
     "vendor": "@:components.productHero.vendor",
     "version": "@:components.productHero.version",
     "visitWebsite": "@:components.productHero.visitWebsite",

translations/en/pages/stacks.json

@@ -95,7 +95,7 @@
     "pricing": "@:shared.common.pricing",
     "specifications": "Specifications",
     "stars": "@:components.productHero.stars",
-    "totalContext": "Total Context",
+    "contextWindow": "Total Context",
     "vendor": "@:components.productHero.vendor",
     "version": "@:components.productHero.version",
     "visitWebsite": "@:components.productHero.visitWebsite",

translations/ko/pages/stacks.json

@@ -95,7 +95,7 @@
     "pricing": "가격",
     "specifications": "사양",
     "stars": "@:components.productHero.stars",
-    "totalContext": "전체 컨텍스트",
+    "contextWindow": "전체 컨텍스트",
     "vendor": "@:components.productHero.vendor",
     "version": "@:components.productHero.version",
     "visitWebsite": "@:components.productHero.visitWebsite",

translations/zh-Hans/pages/stacks.json

@@ -95,7 +95,7 @@
     "pricing": "定价",
     "specifications": "规格",
     "stars": "@:components.productHero.stars",
-    "totalContext": "总上下文",
+    "contextWindow": "总上下文",
     "vendor": "@:components.productHero.vendor",
     "version": "@:components.productHero.version",
     "visitWebsite": "@:components.productHero.visitWebsite",