feat: add study modes to Memorize page

- Add 4 study modes: order-limited, order-infinite, random-limited, random-infinite
- Add mode selector buttons with icons
- Update progress display for infinite modes
- Add translations for all 8 locales

messages/fr-FR.json

@@ -304,32 +304,11 @@
       "showAnswer": "Montrer réponse",
       "nextCard": "Suivant",
       "again": "Encore",
-      "hard": "Difficile",
-      "good": "Bien",
-      "easy": "Facile",
-      "now": "Maintenant",
-      "lessThanMinute": "moins d'une minute",
-      "inMinutes": "dans {n} minute{s}",
-      "inHours": "dans {n} heure{s}",
-      "inDays": "dans {n} jour{s}",
-      "inMonths": "dans {n} mois",
-      "minutes": "minutes",
-      "days": "jours",
-      "months": "mois",
-      "minAbbr": "min",
-      "dayAbbr": "j",
-      "cardTypeNew": "Nouveau",
-      "cardTypeLearning": "Apprentissage",
-      "cardTypeReview": "Révision",
-      "cardTypeRelearning": "Réapprentissage",
-      "reverse": "Inverser",
-      "dictation": "Dictée",
-      "clickToPlay": "Cliquer pour jouer",
-      "yourAnswer": "Votre réponse",
-      "typeWhatYouHear": "Tapez ce que vous entendez",
-      "correct": "Correct!",
-      "incorrect": "Incorrect",
-      "nextCard": "Suivant"
+      "modeOrderLimited": "Ordre",
+      "modeOrderInfinite": "Boucle",
+      "modeRandomLimited": "Aléatoire",
+      "modeRandomInfinite": "Aléatoire Boucle",
+      "restart": "Recommencer"
     },
     "page": {
       "unauthorized": "Non autorisé"