Improve modal accessibility

[Pilopa]

Proposed changes

This PR uses core changes to improve modal accessibility.

Your checklist for this pull request

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Contributor:

• PR is well described and the description can be used as a commit message on squash
• Related issues linked to PR if existing and labels set
• Changelog entry file created in gradle/changelog or CHANGELOG.md is updated for plugins

Reviewer:

• The clean code principles are respected (CleanCode)
• All new code/logic is implemented on the right spot / "Should this be done here?"
• UI changes fits into the layout
• The UI views / components are responsive (mobile views)
• Correct translations are available

Checklist for branch merge request (not required for forks)

• Branch is green/blue on Jenkins
• Quality Gate passed on SonarQube