Add Alt Text to Default Demo Content in Varbase Media Demo Module

Problem/Motivation

Following the accessibility improvement in
#3552431: Enable Alt Text Field for Cover Image in Remote Video and Local Video Media Types to Improve Accessibility
the Varbase Media Demo module still includes default media content (e.g., demo images, local videos, and remote videos) without Alt text values.

This results in accessibility warnings and fails to meet WCAG 2.2 – Success Criterion 1.1.1 (Non-text Content) when testing the demo site or exported configuration.
Providing Alt text for these demo items is essential for:
Demonstrating accessibility best practices out of the box.
Offering editors an example of properly described visual content.
Avoiding confusion or poor audit results when users install Varbase for evaluation.

Steps to reproduce

• Install Varbase and enable the Varbase Media Demo module.
• Inspect demo media items: Local or remote video cover images.
• Observe that most demo images have an empty Alt text field.
• Run accessibility audit (axe, Lighthouse, Siteimprove) → Missing alt attribute errors appear.

Proposed resolution

Update all default media video entities provided by Varbase Media Demo to include meaningful Alt text.

Remaining tasks

• ✅ File an issue about this project
• ✅ Addition/Change/Update/Fix to this project
• ✅ Testing to ensure no regression
• ➖ Automated unit/functional testing coverage
• ➖ Developer Documentation support on feature change/addition
• ➖ User Guide Documentation support on feature change/addition
• ➖ UX/UI designer responsibilities
• ➖ Accessibility and Readability
• ✅ Code review from 1 Varbase core team member
• ✅ Full testing and approval
• ✅ Credit contributors
• ✅ Review with the product owner
• ✅ Update Release Notes and Update Helper on new feature change/addition
• ✅ Release varbase-10.1.0-beta1, varbase_media_demo-10.1.0-beta1

Varbase update type

• ✅ No Update
• ➖ Optional Update
• ➖ Forced Update
• ➖ Forced Update if Unchanged

User interface changes

Media Library Grid view 1

Media Library Grid view 2

Media Library - Images

Media Library - Remote Videos

Media Library - Local Videos

API changes

• N/A

Data model changes

• N/A

Release notes snippet

• [#3552652] chore(a11y): Added Alt Text to Default Demo Content in Varbase Media Demo Module