fix: add missing translations and fix namespace usage

- Fix srt-player to use srtT namespace for error messages
- Add deck_id.enterLanguageName and language labels (english, chinese, japanese, korean)
- Add memorize.review.nextCard translation
- Update all 8 locales with consistent translations

messages/fr-FR.json

@@ -165,6 +165,11 @@
     "sentencePlaceholder": "Entrer phrase",
     "wordPlaceholder": "Entrer mot",
     "queryLang": "Langue de requête",
+    "enterLanguageName": "Veuillez entrer le nom de la langue",
+    "english": "Anglais",
+    "chinese": "Chinois",
+    "japanese": "Japonais",
+    "korean": "Coréen",
     "meanings": "Significations",
     "addMeaning": "Ajouter signification",
     "partOfSpeech": "Partie du discours",
@@ -297,6 +302,7 @@
       "ease": "Facilité",
       "lapses": "Erreurs",
       "showAnswer": "Montrer réponse",
+      "nextCard": "Suivant",
       "again": "Encore",
       "hard": "Difficile",
       "good": "Bien",