Add a description key to theme.json style variations

[ramonopoly]

Add description to VALID_TOP_LEVEL_KEYS in class-wp-theme-json.php to allow for accessibility improvements.

See Gutenberg plugin PR: ​https://github.com/WordPress/gutenberg/pull/45242

The description is added to the aria label of the style variation container.

If the style variation has no description, only the title is used.

Style variations are mostly visual, and there needs to be a text alternative that describes them.

One purpose is to use the text description to improve the style variation preview in the WordPress.org theme directory.

props @poena

Backporting changes from ​https://github.com/WordPress/gutenberg/pull/45242

Adds description to VALID_TOP_LEVEL_KEYS in class-wp-theme-json.php to allow for an accessibility improvement.

The description is added to the aria label of the style variation container. If the style variation has no description, only the title is used.

props @carolinan

Trac ticket: \https://core.trac.wordpress.org/ticket/58614

[audrasjb]

Thanks for the patch!
Self assigning for commit.

[audrasjb]

In 56041:

Editor: Add a description key to theme.json style variations.

This changeset adds description to VALID_TOP_LEVEL_KEYS in class-wp-theme-json.php to allow for accessibility improvements. The description is added to
the ARIA label of the style variation container. If the style variation has no description, only the title is used. One purpose is to use the text description
to improve the style variation preview in the WordPress.org theme directory.

See ​https://github.com/WordPress/gutenberg/pull/45242.

Props ramonopoly, poena.
Fixes #58614.

--Cette ligne, et les suivantes ci-dessous, seront ignorées--

M trunk/src/wp-includes/class-wp-theme-json.php

committed in https://core.trac.wordpress.org/changeset/56041

Hey, this PR missed backporting one file (theme-i18n.json), see report and next steps at ​https://github.com/WordPress/gutenberg/pull/45242#issuecomment-2196574068

Hey, this PR missed backporting one file (theme-i18n.json), see report and next steps

Thanks @oandregal

I took a stab at it, but I'm not confident I've done everything correctly.

See comment: ​https://github.com/WordPress/gutenberg/pull/45242#issuecomment-2198826119