fix: In-video quiz: Change text in button from 'Add to course' to 'Save'

[djoseph-apphelix]

Description

Updated the save button label in the InVideoQuiz editor from "Add to course" to "Save", using the existing messages.save message

This change impacts course authors and instructors (anyone with Studio access who can edit course content). Specifically, users with these roles:

• Course Staff - can edit course content in Studio
• Course Admins/Instructors - full course editing privileges
• Global Staff - platform-wide access

It does not impact learners — the change is purely in the Studio editor UI, not the learner-facing experience.

Screenshot

Jira ticket

TNL2-542

Testing instructions

• Open the InVideoQuiz editor
• Verify the save button displays "Save" instead of "Add to course"

[Copilot]

Pull request overview

Updates the Studio-only InVideoQuiz editor’s primary action button text to better reflect the action being taken by changing the label from “Add to course” to “Save”, reusing an existing i18n message.

Changes:

• Switch EditorContainer’s saveButtonLabel to messages.save.
• Switch EditorContainer’s saveButtonAriaLabel to messages.save.

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