Enhance speech input handling in VocabLessonView: Introduce fallback instructions and placeholders for unsupported speech recognition in English, German, and Spanish. Update exercise instructions to dynamically display fallback options, improving user experience for speech-related exercises.

frontend/src/i18n/locales/de/socialnetwork.json

@@ -437,6 +437,8 @@
                 "recordingError": "Aufnahme-Fehler",
                 "recognizedText": "Erkannter Text",
                 "speechRecognitionNotSupported": "Speech Recognition wird von diesem Browser nicht unterstützt. Bitte verwende Chrome oder Edge.",
+                "speakingFallbackInstruction": "Dein Browser unterstützt hier keine Spracheingabe. Schreibe deine gesprochene Antwort stattdessen als Text auf und prüfe sie dann normal.",
+                "speakingFallbackPlaceholder": "Schreibe hier, was du sagen würdest ...",
                 "keywords": "Schlüsselwörter",
                 "switchBackToMultipleChoice": "Zurück zu Multiple Choice",
                 "languageAssistantEyebrow": "Sprachassistent",

frontend/src/i18n/locales/en/socialnetwork.json

@@ -437,6 +437,8 @@
                 "recordingError": "Recording error",
                 "recognizedText": "Recognized Text",
                 "speechRecognitionNotSupported": "Speech Recognition is not supported by this browser. Please use Chrome or Edge.",
+                "speakingFallbackInstruction": "Your browser does not support speech input here. Write down what you would say instead and check it normally.",
+                "speakingFallbackPlaceholder": "Write what you would say here ...",
                 "keywords": "Keywords",
                 "switchBackToMultipleChoice": "Switch back to Multiple Choice",
                 "languageAssistantEyebrow": "Language assistant",

frontend/src/i18n/locales/es/socialnetwork.json

@@ -434,6 +434,8 @@
                 "recordingError": "Error de grabación",
                 "recognizedText": "Texto reconocido",
                 "speechRecognitionNotSupported": "El reconocimiento de voz no es compatible con este navegador. Usa Chrome o Edge.",
+                "speakingFallbackInstruction": "Tu navegador no admite entrada de voz aquí. Escribe en su lugar lo que dirías y compruébalo normalmente.",
+                "speakingFallbackPlaceholder": "Escribe aquí lo que dirías ...",
                 "keywords": "Palabras clave",
                 "switchBackToMultipleChoice": "Volver a opción múltiple",
                 "languageAssistantEyebrow": "Asistente de idiomas",

frontend/src/views/social/VocabLessonView.vue

@@ -478,8 +478,10 @@
           <!-- Reading Aloud Übung -->
           <div v-else-if="getExerciseType(exercise) === 'reading_aloud'" class="reading-aloud-exercise">
             <p class="exercise-question">{{ getQuestionText(exercise) }}</p>
-            <p class="exercise-instruction">{{ $t('socialnetwork.vocab.courses.readingAloudInstruction') }}</p>
-            <div class="reading-aloud-controls">
+            <p class="exercise-instruction">
+              {{ isSpeechRecognitionSupported ? $t('socialnetwork.vocab.courses.readingAloudInstruction') : $t('socialnetwork.vocab.courses.speakingFallbackInstruction') }}
+            </p>
+            <div v-if="isSpeechRecognitionSupported" class="reading-aloud-controls">
               <button 
                 v-if="!isRecording(exercise.id)" 
                 @click="startReadingAloud(exercise.id)" 
@@ -496,6 +498,13 @@
                 {{ $t('socialnetwork.vocab.courses.stopRecording') }}
               </button>
             </div>
+            <div v-else class="speech-fallback">
+              <textarea
+                v-model="exerciseAnswers[exercise.id]"
+                :placeholder="$t('socialnetwork.vocab.courses.speakingFallbackPlaceholder')"
+                class="response-textarea"
+              />
+            </div>
             <div v-if="recordingStatus[exercise.id]" class="recording-status" :class="{ 'recording': isRecording(exercise.id) }">
               <span v-if="isRecording(exercise.id)">{{ $t('socialnetwork.vocab.courses.recording') }}...</span>
               <span v-else>{{ recordingStatus[exercise.id] }}</span>
@@ -505,7 +514,7 @@
               <p>{{ recognizedText[exercise.id] }}</p>
             </div>
             <button 
-              v-if="recognizedText[exercise.id] && !isRecording(exercise.id)" 
+              v-if="(recognizedText[exercise.id] && !isRecording(exercise.id)) || (!isSpeechRecognitionSupported && exerciseAnswers[exercise.id])" 
               @click="checkAnswer(exercise.id)" 
               class="btn-check"
             >
@@ -526,12 +535,14 @@
           <!-- Speaking From Memory Übung -->
           <div v-else-if="getExerciseType(exercise) === 'speaking_from_memory'" class="speaking-from-memory-exercise">
             <p class="exercise-question">{{ getQuestionText(exercise) }}</p>
-            <p class="exercise-instruction">{{ $t('socialnetwork.vocab.courses.speakingFromMemoryInstruction') }}</p>
+            <p class="exercise-instruction">
+              {{ isSpeechRecognitionSupported ? $t('socialnetwork.vocab.courses.speakingFromMemoryInstruction') : $t('socialnetwork.vocab.courses.speakingFallbackInstruction') }}
+            </p>
             <div v-if="getQuestionData(exercise)?.keywords" class="keywords-hint">
               <strong>{{ $t('socialnetwork.vocab.courses.keywords') }}:</strong>
               <span v-for="(keyword, idx) in getQuestionData(exercise).keywords" :key="idx" class="keyword-tag">{{ keyword }}</span>
             </div>
-            <div class="speaking-controls">
+            <div v-if="isSpeechRecognitionSupported" class="speaking-controls">
               <button 
                 v-if="!isRecording(exercise.id)" 
                 @click="startSpeakingFromMemory(exercise.id)" 
@@ -548,6 +559,13 @@
                 {{ $t('socialnetwork.vocab.courses.stopRecording') }}
               </button>
             </div>
+            <div v-else class="speech-fallback">
+              <textarea
+                v-model="exerciseAnswers[exercise.id]"
+                :placeholder="$t('socialnetwork.vocab.courses.speakingFallbackPlaceholder')"
+                class="response-textarea"
+              />
+            </div>
             <div v-if="recordingStatus[exercise.id]" class="recording-status" :class="{ 'recording': isRecording(exercise.id) }">
               <span v-if="isRecording(exercise.id)">{{ $t('socialnetwork.vocab.courses.recording') }}...</span>
               <span v-else>{{ recordingStatus[exercise.id] }}</span>
@@ -557,7 +575,7 @@
               <p>{{ recognizedText[exercise.id] }}</p>
             </div>
             <button 
-              v-if="recognizedText[exercise.id] && !isRecording(exercise.id)" 
+              v-if="(recognizedText[exercise.id] && !isRecording(exercise.id)) || (!isSpeechRecognitionSupported && exerciseAnswers[exercise.id])" 
               @click="checkAnswer(exercise.id)" 
               class="btn-check"
             >