feat(flashcards): add alt text support for term and definition images

[pganesh-apphelix]

Description

• Adds accessibility support for Flashcards images by introducing explicit alt text fields for term and definition images.

Jira

• https://2u-internal.atlassian.net/browse/TNL2-518

Version

• 1.0.12

[Copilot]

Pull request overview

This PR enhances accessibility for the Flashcards feature by adding explicit alt text fields for term and definition images, allowing content creators to provide more meaningful descriptions than the default fallback to term/definition text.

Changes:

• Introduced new constants for alt text fields (TERM_IMAGE_ALT, DEFINITION_IMAGE_ALT)
• Updated backend handlers to process and store alt text data with fallback logic
• Modified frontend JavaScript to use explicit alt text when rendering images

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
setup.py	Bumped version to 1.0.12
games/constants.py	Added constants for term and definition image alt text fields
games/handlers/common.py	Updated save handler to persist alt text fields
games/handlers/flashcards.py	Added logic to extract and provide alt text with fallbacks to term/definition text
games/static/js/src/flashcards.js	Updated image rendering to use explicit alt text fields with fallback logic

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