feat(localization): enhance course progress and review messaging across multiple languages

- Added new confirmation titles and messages for resetting and marking lessons as complete in admin and user interfaces.
- Expanded course flow and review scheduling messages to improve clarity and user guidance in Cebuano, German, Spanish, and English.
- Introduced a new section in the VocabCourseView to display today's recommended steps for users, enhancing the learning experience.
- Updated localization files to ensure consistent messaging and improved user engagement across all supported languages.

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

@@ -37,6 +37,7 @@
             "selectCourse": "Course",
             "selectLesson": "Lesson",
             "reset": "Reset lesson for this user",
+            "confirmTitle": "Delete lesson progress",
             "confirm": "Really delete progress for lesson “{lesson}” for {username}?",
             "success": "Lesson progress was reset.",
             "error": "Reset failed.",
@@ -50,6 +51,7 @@
             "throughLabel": "All lessons up to and including lesson number",
             "hint": "Marks missing or open rows as completed, including target score and first review wave. Already completed lessons are left unchanged.",
             "submit": "Mark through here as completed",
+            "confirmTitle": "Mark lessons complete",
             "confirm": "Mark every lesson with number ≤ {n} for {username} in this course as completed?",
             "success": "{marked} lesson(s) newly marked complete ({unchanged} were already done).",
             "successNone": "No change: all affected lessons ({unchanged}) were already completed.",