feat(vocab): implement SRS features and enhance vocabulary management

- Added new endpoints in vocabController for retrieving SRS due items and reviewing SRS items, improving spaced repetition support.
- Updated vocabService to handle SRS item creation and scheduling, ensuring effective tracking of vocabulary exposure.
- Enhanced vocabRouter with new routes for SRS functionalities, facilitating user interaction with spaced repetition features.
- Modified VocabPracticeDialog and VocabCourseView to integrate SRS due items, providing users with timely review opportunities.
- Updated translations and UI elements to reflect new SRS features, enhancing user experience and accessibility.

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

@@ -726,7 +726,12 @@
                 "quickReviewPromptMeaning": "What does \"{term}\" mean?",
                 "quickReviewPromptTarget": "Type sa target pinulongan: \"{term}\"",
                 "quickReviewAcknowledge": "Read, continue",
-                "courseTodayPlanIntroNoDueReview": "Walay angay nga mubo nga balik-balik karon. Makita nimo ang sunod nga makatarunganon nga lakang sa block (limitado sa kabug-aton), unya ang intensive kung naay. Ang mubo nga balik-balik mobalik sa 1/3/7 ka adlaw."
+                "courseTodayPlanIntroNoDueReview": "Walay angay nga mubo nga balik-balik karon. Makita nimo ang sunod nga makatarunganon nga lakang sa block (limitado sa kabug-aton), unya ang intensive kung naay. Ang mubo nga balik-balik mobalik sa 1/3/7 ka adlaw.",
+                "srsDueStat": "SRS angay: {count}",
+                "srsEyebrow": "Dugay nga memorya",
+                "srsTitle": "{count} ka termino ang angay karon",
+                "srsIntro": "Kini nga balik-balik gikan sa SRS nga plano sa matag pulong. Una kini kaysa bag-ong materyal kay nagpalig-on kini sa mga pulong nga hapit malimtan.",
+                "srsStart": "Sugdi ang daily review"
             },
             "title": "Trainer sa bokabularyo",
             "description": "Paghimo og pinulongans (or subscribe aron them) ug share them uban sa friends.",

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

@@ -424,8 +424,7 @@
             "subscribe": "Abonnieren",
             "subscribeSuccess": "Abo erfolgreich. Menü wird aktualisiert.",
             "subscribeError": "Abo fehlgeschlagen. Code ungültig oder kein Zugriff.",
-            "trainerPlaceholder": "Trainer-Funktionen (Vokabeln/Abfragen) kommen als nächster Schritt."
-            ,
+            "trainerPlaceholder": "Trainer-Funktionen (Vokabeln/Abfragen) kommen als nächster Schritt.",
             "chapters": "Kapitel",
             "newChapter": "Neues Kapitel",
             "createChapter": "Kapitel anlegen",
@@ -437,8 +436,7 @@
             "referenceWord": "Referenz",
             "add": "Hinzufügen",
             "addVocabError": "Konnte Vokabel nicht hinzufügen.",
-            "noVocabs": "In diesem Kapitel sind noch keine Vokabeln."
-            ,
+            "noVocabs": "In diesem Kapitel sind noch keine Vokabeln.",
             "practice": {
                 "open": "Üben",
                 "title": "Vokabeln üben",
@@ -810,7 +808,12 @@
                 "lessonReviewHintNextDue": "Nächste Fälligkeit: {due}.",
                 "reviewTimeNow": "jetzt",
                 "reviewTimeTomorrow": "morgen",
-                "reviewTimeInDays": "in {count} Tagen"
+                "reviewTimeInDays": "in {count} Tagen",
+                "srsDueStat": "SRS fällig: {count}",
+                "srsEyebrow": "Langzeitgedächtnis",
+                "srsTitle": "{count} Begriffe sind heute fällig",
+                "srsIntro": "Diese Wiederholung kommt aus dem SRS-Plan einzelner Begriffe. Sie hat Vorrang vor neuem Stoff, weil sie kurz vor dem Vergessen stabilisiert.",
+                "srsStart": "Tageswiederholung starten"
             }
         }
     }

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

@@ -424,8 +424,7 @@
             "subscribe": "Subscribe",
             "subscribeSuccess": "Subscribed. The menu will refresh.",
             "subscribeError": "Subscribe failed. Invalid code or no access.",
-            "trainerPlaceholder": "Trainer features (words/quizzes) will be the next step."
-            ,
+            "trainerPlaceholder": "Trainer features (words/quizzes) will be the next step.",
             "chapters": "Chapters",
             "newChapter": "New chapter",
             "createChapter": "Create chapter",
@@ -437,8 +436,7 @@
             "referenceWord": "Reference",
             "add": "Add",
             "addVocabError": "Could not add vocabulary.",
-            "noVocabs": "No vocabulary in this chapter yet."
-            ,
+            "noVocabs": "No vocabulary in this chapter yet.",
             "practice": {
                 "open": "Practice",
                 "title": "Practice vocabulary",
@@ -810,7 +808,12 @@
                 "lessonReviewHintNextDue": "Next due date: {due}.",
                 "reviewTimeNow": "now",
                 "reviewTimeTomorrow": "tomorrow",
-                "reviewTimeInDays": "in {count} days"
+                "reviewTimeInDays": "in {count} days",
+                "srsDueStat": "SRS due: {count}",
+                "srsEyebrow": "Long-term memory",
+                "srsTitle": "{count} terms are due today",
+                "srsIntro": "This review comes from the SRS schedule of individual terms. It should come before new material because it stabilizes items close to forgetting.",
+                "srsStart": "Start daily review"
             }
         }
     }