Wire Parent Quiz to central translation system + native language audio

Uses useNativeLanguage() hook for all UI text. Shows native language
translation of vocab word + audio button for native pronunciation.
Removed inline pt translations dict (now in exerciseTranslations.ts).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

studio-v2/app/parent/quiz/[unitId]/page.tsx

@@ -5,30 +5,21 @@ import { useParams, useRouter } from 'next/navigation'
 import { useTheme } from '@/lib/ThemeContext'
 import { useLanguage } from '@/lib/LanguageContext'
 import { AudioButton } from '@/components/learn/AudioButton'
+import { useNativeLanguage } from '@/lib/useNativeLanguage'
 
 interface QAItem {
   id: string; question: string; answer: string
   translations?: Record<string, { text?: string }>
 }
 
-const pt: Record<string, Record<string, string>> = {
+// UI translations now come from useNativeLanguage() hook + exerciseTranslations.ts
-  ask_child: { de: 'Fragen Sie Ihr Kind:', tr: '\u00c7ocu\u011funuza sorun:', ar: '\u0627\u0633\u0623\u0644 \u0637\u0641\u0644\u0643:', uk: '\u0417\u0430\u043f\u0438\u0442\u0430\u0439\u0442\u0435 \u0434\u0438\u0442\u0438\u043d\u0443:', ru: '\u0421\u043f\u0440\u043e\u0441\u0438\u0442\u0435 \u0440\u0435\u0431\u0435\u043d\u043a\u0430:', en: 'Ask your child:' },
-  correct_answer: { de: 'Richtige Antwort:', tr: 'Do\u011fru cevap:', ar: '\u0627\u0644\u0625\u062c\u0627\u0628\u0629 \u0627\u0644\u0635\u062d\u064a\u062d\u0629:', uk: '\u041f\u0440\u0430\u0432\u0438\u043b\u044c\u043d\u0430 \u0432\u0456\u0434\u043f\u043e\u0432\u0456\u0434\u044c:', ru: '\u041f\u0440\u0430\u0432\u0438\u043b\u044c\u043d\u044b\u0439 \u043e\u0442\u0432\u0435\u0442:', en: 'Correct answer:' },
-  show_answer: { de: 'Antwort zeigen', tr: 'Cevab\u0131 g\u00f6ster', ar: '\u0625\u0638\u0647\u0627\u0631 \u0627\u0644\u0625\u062c\u0627\u0628\u0629', uk: '\u041f\u043e\u043a\u0430\u0437\u0430\u0442\u0438 \u0432\u0456\u0434\u043f\u043e\u0432\u0456\u0434\u044c', ru: '\u041f\u043e\u043a\u0430\u0437\u0430\u0442\u044c \u043e\u0442\u0432\u0435\u0442', en: 'Show answer' },
-  hide_answer: { de: 'Antwort verbergen', tr: 'Cevab\u0131 gizle', ar: '\u0625\u062e\u0641\u0627\u0621 \u0627\u0644\u0625\u062c\u0627\u0628\u0629', uk: '\u0421\u0445\u043e\u0432\u0430\u0442\u0438 \u0432\u0456\u0434\u043f\u043e\u0432\u0456\u0434\u044c', ru: '\u0421\u043a\u0440\u044b\u0442\u044c \u043e\u0442\u0432\u0435\u0442', en: 'Hide answer' },
-  wrong: { de: 'Falsch', tr: 'Yanl\u0131\u015f', ar: '\u062e\u0637\u0623', uk: '\u041d\u0435\u043f\u0440\u0430\u0432\u0438\u043b\u044c\u043d\u043e', ru: '\u041d\u0435\u043f\u0440\u0430\u0432\u0438\u043b\u044c\u043d\u043e', en: 'Wrong' },
-  correct: { de: 'Richtig', tr: 'Do\u011fru', ar: '\u0635\u062d\u064a\u062d', uk: '\u041f\u0440\u0430\u0432\u0438\u043b\u044c\u043d\u043e', ru: '\u041f\u0440\u0430\u0432\u0438\u043b\u044c\u043d\u043e', en: 'Correct' },
-  done: { de: 'Fertig!', tr: 'Bitti!', ar: '\u0627\u0646\u062a\u0647\u0649!', uk: '\u0413\u043e\u0442\u043e\u0432\u043e!', ru: '\u0413\u043e\u0442\u043e\u0432\u043e!', en: 'Done!' },
-  again: { de: 'Nochmal', tr: 'Tekrar', ar: '\u0645\u0631\u0629 \u0623\u062e\u0631\u0649', uk: '\u0429\u0435 \u0440\u0430\u0437', ru: '\u0415\u0449\u0435 \u0440\u0430\u0437', en: 'Again' },
-  back: { de: 'Zurueck', tr: 'Geri', ar: '\u0631\u062c\u0648\u0639', uk: '\u041d\u0430\u0437\u0430\u0434', ru: '\u041d\u0430\u0437\u0430\u0434', en: 'Back' },
-  question: { de: 'Frage', tr: 'Soru', ar: '\u0633\u0624\u0627\u0644', uk: '\u041f\u0438\u0442\u0430\u043d\u043d\u044f', ru: '\u0412\u043e\u043f\u0440\u043e\u0441', en: 'Question' },
-}
 
 export default function ParentQuizPage() {
   const { unitId } = useParams<{ unitId: string }>()
   const router = useRouter()
   const { isDark } = useTheme()
   const { language } = useLanguage()
+  const { t, wordInNative, nativeLang, isThirdLanguage } = useNativeLanguage()
 
   const [items, setItems] = useState<QAItem[]>([])
   const [currentIndex, setCurrentIndex] = useState(0)
@@ -37,8 +28,6 @@ export default function ParentQuizPage() {
   const [stats, setStats] = useState({ correct: 0, incorrect: 0 })
   const [isComplete, setIsComplete] = useState(false)
 
-  const t = (key: string) => pt[key]?.[language] || pt[key]?.['de'] || key
-
   const glassCard = isDark
     ? 'bg-white/10 backdrop-blur-xl border border-white/10'
     : 'bg-white/80 backdrop-blur-xl border border-black/5'
@@ -62,7 +51,7 @@ export default function ParentQuizPage() {
   }, [currentIndex, items.length])
 
   const currentItem = items[currentIndex]
-  const nativeTranslation = currentItem?.translations?.[language]?.text || ''
+  const nativeTranslation = wordInNative(currentItem?.translations)
 
   if (isLoading) {
     return (
@@ -127,6 +116,9 @@ export default function ParentQuizPage() {
               )}
               <div className="flex justify-center gap-3 mt-4">
                 <AudioButton text={currentItem.question} lang="en" isDark={isDark} size="md" />
+                {nativeTranslation && (
+                  <AudioButton text={nativeTranslation} lang={nativeLang as 'en' | 'de'} isDark={isDark} size="md" />
+                )}
               </div>
             </div>