Make /learn the central landing page for parents + students

Non-DE/EN users (parents) see a guide panel explaining:
- What this page is (vocabulary exercises from teacher)
- How each exercise type works (cards, quiz, listen, speak)
- All text in parent's native language (TR/AR/UK/RU/PL)

German/English users see the original layout without the guide.
This is the single entry point — no need to duplicate explanations
in every exercise sub-page.

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

studio-v2/app/learn/page.tsx

@@ -3,6 +3,7 @@
 import React, { useState, useEffect } from 'react'
 import { useTheme } from '@/lib/ThemeContext'
 import { UnitCard } from '@/components/learn/UnitCard'
+import { useNativeLanguage } from '@/lib/useNativeLanguage'
 
 interface LearningUnit {
   id: string
@@ -16,12 +17,87 @@ interface LearningUnit {
   created_at: string
 }
 
-function getApiBase() {
+// Parent guide translations
-  return ''  // Same-origin proxy via /api/learning-units/...
+const guide: Record<string, Record<string, string>> = {
+  welcome: {
+    de: 'Willkommen bei den Lernmodulen!',
+    en: 'Welcome to the learning modules!',
+    tr: 'Ogrenme modullerine hos geldiniz!',
+    ar: '\u0645\u0631\u062d\u0628\u0627 \u0628\u0643 \u0641\u064a \u0648\u062d\u062f\u0627\u062a \u0627\u0644\u062a\u0639\u0644\u0645!',
+    uk: '\u041b\u0430\u0441\u043a\u0430\u0432\u043e \u043f\u0440\u043e\u0441\u0438\u043c\u043e \u0434\u043e \u043d\u0430\u0432\u0447\u0430\u043b\u044c\u043d\u0438\u0445 \u043c\u043e\u0434\u0443\u043b\u0456\u0432!',
+    ru: '\u0414\u043e\u0431\u0440\u043e \u043f\u043e\u0436\u0430\u043b\u043e\u0432\u0430\u0442\u044c \u0432 \u0443\u0447\u0435\u0431\u043d\u044b\u0435 \u043c\u043e\u0434\u0443\u043b\u0438!',
+    pl: 'Witamy w modulach do nauki!',
+  },
+  what_is_this: {
+    de: 'Was ist das?',
+    en: 'What is this?',
+    tr: 'Bu nedir?',
+    ar: '\u0645\u0627 \u0647\u0630\u0627\u061f',
+    uk: '\u0429\u043e \u0446\u0435?',
+    ru: '\u0427\u0442\u043e \u044d\u0442\u043e?',
+    pl: 'Co to jest?',
+  },
+  explanation: {
+    de: 'Der Lehrer Ihres Kindes hat Vokabeln zusammengestellt, die Ihr Kind lernen muss. Hier koennen Sie Ihrem Kind beim Ueben helfen — auch wenn Sie selbst kein Deutsch oder Englisch sprechen. Jedes Wort wird in Ihrer Sprache angezeigt.',
+    en: 'Your child\'s teacher has prepared vocabulary that your child needs to learn. Here you can help your child practice — even if you don\'t speak German or English. Every word is shown in your language.',
+    tr: 'Cocugunuzun ogretmeni, cocugunuzun ogrenmesi gereken kelimeleri hazirladi. Burada cocugunuzun pratik yapmasina yardimci olabilirsiniz — Almanca veya Ingilizce bilmeseniz bile. Her kelime sizin dilinizde gosterilir.',
+    ar: '\u0623\u0639\u062f \u0645\u0639\u0644\u0645 \u0637\u0641\u0644\u0643 \u0645\u0641\u0631\u062f\u0627\u062a \u064a\u062d\u062a\u0627\u062c \u0637\u0641\u0644\u0643 \u0644\u062a\u0639\u0644\u0645\u0647\u0627. \u0647\u0646\u0627 \u064a\u0645\u0643\u0646\u0643 \u0645\u0633\u0627\u0639\u062f\u0629 \u0637\u0641\u0644\u0643 \u0639\u0644\u0649 \u0627\u0644\u062a\u062f\u0631\u064a\u0628 \u2014 \u062d\u062a\u0649 \u0644\u043e \u0644\u0645 \u062a\u062a\u062d\u062f\u062b \u0627\u0644\u0623\u0644\u0645\u0627\u0646\u064a\u0629 \u0623\u043e \u0627\u0644\u0625\u0646\u062c\u0644\u064a\u0632\u064a\u0629. \u0643\u0644 \u0643\u0644\u0645\u0629 \u062a\u0638\u0647\u0631 \u0628\u0644\u063a\u062a\u0643.',
+    uk: '\u0412\u0447\u0438\u0442\u0435\u043b\u044c \u0432\u0430\u0448\u043e\u0457 \u0434\u0438\u0442\u0438\u043d\u0438 \u043f\u0456\u0434\u0433\u043e\u0442\u0443\u0432\u0430\u0432 \u0441\u043b\u043e\u0432\u0430, \u044f\u043a\u0456 \u0434\u0438\u0442\u0438\u043d\u0430 \u043f\u043e\u0432\u0438\u043d\u043d\u0430 \u0432\u0438\u0432\u0447\u0438\u0442\u0438. \u0422\u0443\u0442 \u0432\u0438 \u043c\u043e\u0436\u0435\u0442\u0435 \u0434\u043e\u043f\u043e\u043c\u043e\u0433\u0442\u0438 \u0434\u0438\u0442\u0438\u043d\u0456 \u043f\u0440\u0430\u043a\u0442\u0438\u043a\u0443\u0432\u0430\u0442\u0438 \u2014 \u043d\u0430\u0432\u0456\u0442\u044c \u044f\u043a\u0449\u043e \u0432\u0438 \u043d\u0435 \u0440\u043e\u0437\u043c\u043e\u0432\u043b\u044f\u0454\u0442\u0435 \u043d\u0456\u043c\u0435\u0446\u044c\u043a\u043e\u044e \u0447\u0438 \u0430\u043d\u0433\u043b\u0456\u0439\u0441\u044c\u043a\u043e\u044e. \u041a\u043e\u0436\u043d\u0435 \u0441\u043b\u043e\u0432\u043e \u043f\u043e\u043a\u0430\u0437\u0430\u043d\u043e \u0432\u0430\u0448\u043e\u044e \u043c\u043e\u0432\u043e\u044e.',
+    ru: '\u0423\u0447\u0438\u0442\u0435\u043b\u044c \u0432\u0430\u0448\u0435\u0433\u043e \u0440\u0435\u0431\u0435\u043d\u043a\u0430 \u043f\u043e\u0434\u0433\u043e\u0442\u043e\u0432\u0438\u043b \u0441\u043b\u043e\u0432\u0430, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u0440\u0435\u0431\u0435\u043d\u043e\u043a \u0434\u043e\u043b\u0436\u0435\u043d \u0432\u044b\u0443\u0447\u0438\u0442\u044c. \u0417\u0434\u0435\u0441\u044c \u0432\u044b \u043c\u043e\u0436\u0435\u0442\u0435 \u043f\u043e\u043c\u043e\u0447\u044c \u0440\u0435\u0431\u0435\u043d\u043a\u0443 \u0442\u0440\u0435\u043d\u0438\u0440\u043e\u0432\u0430\u0442\u044c\u0441\u044f \u2014 \u0434\u0430\u0436\u0435 \u0435\u0441\u043b\u0438 \u0432\u044b \u043d\u0435 \u0433\u043e\u0432\u043e\u0440\u0438\u0442\u0435 \u043f\u043e-\u043d\u0435\u043c\u0435\u0446\u043a\u0438 \u0438\u043b\u0438 \u043f\u043e-\u0430\u043d\u0433\u043b\u0438\u0439\u0441\u043a\u0438. \u041a\u0430\u0436\u0434\u043e\u0435 \u0441\u043b\u043e\u0432\u043e \u043f\u043e\u043a\u0430\u0437\u0430\u043d\u043e \u043d\u0430 \u0432\u0430\u0448\u0435\u043c \u044f\u0437\u044b\u043a\u0435.',
+    pl: 'Nauczyciel Twojego dziecka przygotowal slowka, ktorych dziecko musi sie nauczyc. Tutaj mozesz pomoc dziecku cwczyc — nawet jesli nie mowisz po niemiecku ani angielsku. Kazde slowo jest pokazane w Twoim jezyku.',
+  },
+  exercises_explained: {
+    de: 'Waehlen Sie eine Uebung:',
+    en: 'Choose an exercise:',
+    tr: 'Bir alistirma secin:',
+    ar: '\u0627\u062e\u062a\u0631 \u062a\u0645\u0631\u064a\u0646\u0627:',
+    uk: '\u0412\u0438\u0431\u0435\u0440\u0456\u0442\u044c \u0432\u043f\u0440\u0430\u0432\u0443:',
+    ru: '\u0412\u044b\u0431\u0435\u0440\u0438\u0442\u0435 \u0443\u043f\u0440\u0430\u0436\u043d\u0435\u043d\u0438\u0435:',
+    pl: 'Wybierz cwiczenie:',
+  },
+  exercise_cards: {
+    de: 'Karteikarten — Wort umdrehen und pruefen',
+    tr: 'Kartlar — Kelimeyi cevir ve kontrol et',
+    ar: '\u0628\u0637\u0627\u0642\u0627\u062a \u2014 \u0627\u0642\u0644\u0628 \u0627\u0644\u0643\u0644\u0645\u0629 \u0648\u062a\u062d\u0642\u0642',
+    uk: '\u041a\u0430\u0440\u0442\u043a\u0438 \u2014 \u041f\u0435\u0440\u0435\u0432\u0435\u0440\u043d\u0456\u0442\u044c \u0441\u043b\u043e\u0432\u043e \u0456 \u043f\u0435\u0440\u0435\u0432\u0456\u0440\u0442\u0435',
+    ru: '\u041a\u0430\u0440\u0442\u043e\u0447\u043a\u0438 \u2014 \u041f\u0435\u0440\u0435\u0432\u0435\u0440\u043d\u0438\u0442\u0435 \u0441\u043b\u043e\u0432\u043e \u0438 \u043f\u0440\u043e\u0432\u0435\u0440\u044c\u0442\u0435',
+    pl: 'Fiszki — Odwroc slowo i sprawdz',
+    en: 'Flashcards — Flip the word and check',
+  },
+  exercise_quiz: {
+    de: 'Quiz — Richtige Uebersetzung aus 4 Optionen waehlen',
+    tr: 'Quiz — 4 secenekten dogru ceviriyi sec',
+    ar: '\u0627\u062e\u062a\u0628\u0627\u0631 \u2014 \u0627\u062e\u062a\u0631 \u0627\u0644\u062a\u0631\u062c\u0645\u0629 \u0627\u0644\u0635\u062d\u064a\u062d\u0629 \u0645\u0646 4 \u062e\u064a\u0627\u0631\u0627\u062a',
+    uk: '\u0422\u0435\u0441\u0442 \u2014 \u0412\u0438\u0431\u0435\u0440\u0456\u0442\u044c \u043f\u0440\u0430\u0432\u0438\u043b\u044c\u043d\u0438\u0439 \u043f\u0435\u0440\u0435\u043a\u043b\u0430\u0434 \u0437 4 \u0432\u0430\u0440\u0456\u0430\u043d\u0442\u0456\u0432',
+    ru: '\u0422\u0435\u0441\u0442 \u2014 \u0412\u044b\u0431\u0435\u0440\u0438\u0442\u0435 \u043f\u0440\u0430\u0432\u0438\u043b\u044c\u043d\u044b\u0439 \u043f\u0435\u0440\u0435\u0432\u043e\u0434 \u0438\u0437 4 \u0432\u0430\u0440\u0438\u0430\u043d\u0442\u043e\u0432',
+    pl: 'Quiz — Wybierz poprawne tlumaczenie z 4 opcji',
+    en: 'Quiz — Choose correct translation from 4 options',
+  },
+  exercise_listen: {
+    de: 'Hoeren — Wort hoeren und Uebersetzung waehlen',
+    tr: 'Dinleme — Kelimeyi dinle ve ceviriyi sec',
+    ar: '\u0627\u0633\u062a\u0645\u0627\u0639 \u2014 \u0627\u0633\u062a\u0645\u0639 \u0644\u0644\u0643\u0644\u0645\u0629 \u0648\u0627\u062e\u062a\u0631 \u0627\u0644\u062a\u0631\u062c\u0645\u0629',
+    uk: '\u0421\u043b\u0443\u0445\u0430\u043d\u043d\u044f \u2014 \u041f\u043e\u0441\u043b\u0443\u0445\u0430\u0439 \u0441\u043b\u043e\u0432\u043e \u0456 \u0432\u0438\u0431\u0435\u0440\u0438 \u043f\u0435\u0440\u0435\u043a\u043b\u0430\u0434',
+    ru: '\u0421\u043b\u0443\u0448\u0430\u043d\u0438\u0435 \u2014 \u041f\u043e\u0441\u043b\u0443\u0448\u0430\u0439\u0442\u0435 \u0441\u043b\u043e\u0432\u043e \u0438 \u0432\u044b\u0431\u0435\u0440\u0438\u0442\u0435 \u043f\u0435\u0440\u0435\u0432\u043e\u0434',
+    pl: 'Sluchanie — Posluchaj slowa i wybierz tlumaczenie',
+    en: 'Listening — Hear the word and choose the translation',
+  },
+  exercise_speak: {
+    de: 'Sprechen — Wort hoeren und nachsprechen',
+    tr: 'Konusma — Kelimeyi dinle ve tekrar et',
+    ar: '\u062a\u062d\u062f\u062b \u2014 \u0627\u0633\u062a\u0645\u0639 \u0644\u0644\u0643\u0644\u0645\u0629 \u0648\u0643\u0631\u0631\u0647\u0627',
+    uk: '\u0413\u043e\u0432\u043e\u0440\u0456\u043d\u043d\u044f \u2014 \u041f\u043e\u0441\u043b\u0443\u0445\u0430\u0439 \u0441\u043b\u043e\u0432\u043e \u0456 \u043f\u043e\u0432\u0442\u043e\u0440\u0438',
+    ru: '\u0413\u043e\u0432\u043e\u0440\u0435\u043d\u0438\u0435 \u2014 \u041f\u043e\u0441\u043b\u0443\u0448\u0430\u0439\u0442\u0435 \u0441\u043b\u043e\u0432\u043e \u0438 \u043f\u043e\u0432\u0442\u043e\u0440\u0438\u0442\u0435',
+    pl: 'Mowienie — Posluchaj slowa i powtorz',
+    en: 'Speaking — Hear the word and repeat it',
+  },
 }
 
+function getApiBase() { return '' }
+
 export default function LearnPage() {
   const { isDark } = useTheme()
+  const { t, nativeLang, isThirdLanguage } = useNativeLanguage()
   const [units, setUnits] = useState<LearningUnit[]>([])
   const [isLoading, setIsLoading] = useState(true)
   const [error, setError] = useState<string | null>(null)
@@ -30,17 +106,16 @@ export default function LearnPage() {
     ? 'bg-white/10 backdrop-blur-xl border border-white/10'
     : 'bg-white/80 backdrop-blur-xl border border-black/5'
 
-  useEffect(() => {
+  const g = (key: string) => guide[key]?.[nativeLang] || guide[key]?.['de'] || key
-    loadUnits()
+
-  }, [])
+  useEffect(() => { loadUnits() }, [])
 
   const loadUnits = async () => {
     setIsLoading(true)
     try {
       const resp = await fetch(`${getApiBase()}/api/learning-units/`)
       if (!resp.ok) throw new Error(`HTTP ${resp.status}`)
-      const data = await resp.json()
+      setUnits(await resp.json())
-      setUnits(data)
     } catch (err: any) {
       setError(err.message)
     } finally {
@@ -51,12 +126,8 @@ export default function LearnPage() {
   const handleDelete = async (unitId: string) => {
     try {
       const resp = await fetch(`${getApiBase()}/api/learning-units/${unitId}`, { method: 'DELETE' })
-      if (resp.ok) {
+      if (resp.ok) setUnits(prev => prev.filter(u => u.id !== unitId))
-        setUnits((prev) => prev.filter((u) => u.id !== unitId))
+    } catch {}
-      }
-    } catch (err) {
-      console.error('Delete failed:', err)
-    }
   }
 
   return (
@@ -65,27 +136,48 @@ export default function LearnPage() {
       <div className={`${glassCard} border-0 border-b`}>
         <div className="max-w-5xl mx-auto px-6 py-4">
           <div className="flex items-center gap-4">
-              <div className={`w-12 h-12 rounded-xl flex items-center justify-center ${
+            <div className={`w-12 h-12 rounded-xl flex items-center justify-center ${isDark ? 'bg-blue-500/30' : 'bg-blue-200'}`}>
-                isDark ? 'bg-blue-500/30' : 'bg-blue-200'
-              }`}>
               <svg className={`w-6 h-6 ${isDark ? 'text-blue-300' : 'text-blue-600'}`} fill="none" stroke="currentColor" viewBox="0 0 24 24">
                 <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={1.5} d="M12 6.253v13m0-13C10.832 5.477 9.246 5 7.5 5S4.168 5.477 3 6.253v13C4.168 18.477 5.754 18 7.5 18s3.332.477 4.5 1.253m0-13C13.168 5.477 14.754 5 16.5 5c1.747 0 3.332.477 4.5 1.253v13C19.832 18.477 18.247 18 16.5 18c-1.746 0-3.332.477-4.5 1.253" />
               </svg>
             </div>
             <div>
               <h1 className={`text-xl font-bold ${isDark ? 'text-white' : 'text-slate-900'}`}>
-                  Meine Lernmodule
+                {isThirdLanguage ? g('welcome') : 'Meine Lernmodule'}
               </h1>
               <p className={`text-sm ${isDark ? 'text-white/60' : 'text-slate-500'}`}>
-                  Karteikarten, Quiz und Lueckentexte aus deinen Vokabeln
+                {isThirdLanguage
+                  ? g('exercises_explained')
+                  : 'Karteikarten, Quiz und Lueckentexte aus deinen Vokabeln'}
               </p>
             </div>
           </div>
         </div>
       </div>
 
-        {/* Content */}
       <div className="max-w-5xl mx-auto w-full px-6 py-6">
+        {/* Parent Guide Panel — only for non-DE/EN users */}
+        {isThirdLanguage && (
+          <div className={`${glassCard} rounded-2xl p-6 mb-6`}>
+            <h3 className={`text-sm font-semibold mb-2 ${isDark ? 'text-cyan-300' : 'text-cyan-700'}`}>
+              {g('what_is_this')}
+            </h3>
+            <p className={`text-sm leading-relaxed mb-4 ${isDark ? 'text-white/70' : 'text-slate-600'}`}>
+              {g('explanation')}
+            </p>
+
+            <div className={`border-t pt-3 space-y-1.5 ${isDark ? 'border-white/10' : 'border-slate-200'}`}>
+              <p className={`text-xs ${isDark ? 'text-white/40' : 'text-slate-400'}`}>
+                {g('exercises_explained')}
+              </p>
+              <p className={`text-xs ${isDark ? 'text-white/60' : 'text-slate-500'}`}>🃏 {g('exercise_cards')}</p>
+              <p className={`text-xs ${isDark ? 'text-white/60' : 'text-slate-500'}`}>❓ {g('exercise_quiz')}</p>
+              <p className={`text-xs ${isDark ? 'text-white/60' : 'text-slate-500'}`}>🔊 {g('exercise_listen')}</p>
+              <p className={`text-xs ${isDark ? 'text-white/60' : 'text-slate-500'}`}>🎤 {g('exercise_speak')}</p>
+            </div>
+          </div>
+        )}
+
         {isLoading && (
           <div className="flex items-center justify-center py-20">
             <div className={`w-8 h-8 border-4 ${isDark ? 'border-blue-400' : 'border-blue-600'} border-t-transparent rounded-full animate-spin`} />
@@ -94,40 +186,32 @@ export default function LearnPage() {
 
         {error && (
           <div className={`${glassCard} rounded-2xl p-6 text-center`}>
-              <p className={`${isDark ? 'text-red-300' : 'text-red-600'}`}>Fehler: {error}</p>
+            <p className={isDark ? 'text-red-300' : 'text-red-600'}>Fehler: {error}</p>
             <button onClick={loadUnits} className="mt-3 px-4 py-2 rounded-xl bg-blue-500 text-white text-sm">
-                Erneut versuchen
+              {t('again')}
             </button>
           </div>
         )}
 
         {!isLoading && !error && units.length === 0 && (
           <div className={`${glassCard} rounded-2xl p-12 text-center`}>
-              <div className={`w-16 h-16 mx-auto mb-4 rounded-2xl flex items-center justify-center ${
+            <div className={`w-16 h-16 mx-auto mb-4 rounded-2xl flex items-center justify-center ${isDark ? 'bg-blue-500/20' : 'bg-blue-100'}`}>
-                isDark ? 'bg-blue-500/20' : 'bg-blue-100'
-              }`}>
               <svg className={`w-8 h-8 ${isDark ? 'text-blue-300' : 'text-blue-600'}`} fill="none" stroke="currentColor" viewBox="0 0 24 24">
                 <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={1.5} d="M12 6.253v13m0-13C10.832 5.477 9.246 5 7.5 5S4.168 5.477 3 6.253v13C4.168 18.477 5.754 18 7.5 18s3.332.477 4.5 1.253m0-13C13.168 5.477 14.754 5 16.5 5c1.747 0 3.332.477 4.5 1.253v13C19.832 18.477 18.247 18 16.5 18c-1.746 0-3.332.477-4.5 1.253" />
               </svg>
             </div>
             <h3 className={`text-lg font-semibold mb-2 ${isDark ? 'text-white' : 'text-slate-900'}`}>
-                Noch keine Lernmodule
+              {isThirdLanguage ? g('welcome') : 'Noch keine Lernmodule'}
             </h3>
-              <p className={`text-sm mb-4 ${isDark ? 'text-white/60' : 'text-slate-500'}`}>
+            <a href="/vocabulary" className="inline-block mt-3 px-6 py-3 rounded-xl bg-gradient-to-r from-blue-500 to-cyan-500 text-white font-medium hover:shadow-lg transition-all">
-                Scanne eine Schulbuchseite im Vokabel-Arbeitsblatt Generator und klicke &quot;Lernmodule generieren&quot;.
+              {isThirdLanguage ? g('exercises_explained') : 'Zum Woerterbuch'}
-              </p>
-              <a
-                href="/vocab-worksheet"
-                className="inline-block px-6 py-3 rounded-xl bg-gradient-to-r from-blue-500 to-cyan-500 text-white font-medium hover:shadow-lg transition-all"
-              >
-                Zum Vokabel-Scanner
             </a>
           </div>
         )}
 
         {!isLoading && units.length > 0 && (
           <div className="grid gap-4">
-              {units.map((unit) => (
+            {units.map(unit => (
               <UnitCard key={unit.id} unit={unit} isDark={isDark} glassCard={glassCard} onDelete={handleDelete} />
             ))}
           </div>