LearnDash 4.15.1

Update

• Tweak – Deprecated constants: LEARNDASH_QUIZ_ESSAY_SUBMIT_COMPLETED.
• Tweak – Updated templates: `modules/ai/virtual-instructor/message-default.php`, `modules/ai/virtual-instructor/message-error.php`.

Bugfix

• Fix – Resolved issue where standalone quizzes did not trigger the learndash_quiz_completed action.
• Fix – Resolved issue where the LearnDash Customizer outputted the default CSS values, changing the CSS priorities and affecting some themes.
• Fix – Resolved issue where the switch field in admin settings was not displaying the label correctly depending on the state.