Add Locale from Tags snippet

[jeherve]

Proposed changes:

• Add a new community snippet that sets a post's ActivityPub language based on post tags matching language codes (e.g. en, fr, de).
• Useful for multilingual blogs that tag their posts with a language identifier — the matching tag is then used as the post's locale in the ActivityPub representation.
• Based on https://herve.bzh/wordpress-set-a-posts-language-in-its-activitypub-representation-based-on-post-tags/

Other information:

• Have you written new tests for your changes, if applicable?

This is a community snippet (a standalone micro-plugin in snippets/), not a change to the core plugin. No new tests are needed.

Testing instructions:

1. Copy the snippets/locale-from-tags/ folder into wp-content/plugins/ and activate it.
2. Create or edit a post and add a tag matching one of the default language codes (e.g. en, fr, de).
3. Publish the post and check its ActivityPub JSON representation (append ?activitypub or check the outbox) — the contentMap key should reflect the tag's language code instead of the site's default locale.
4. To test customization, add this to your theme's functions.php:

   add_filter(
       'activitypub_snippet_locale_from_tags_codes',
       function () {
           return array( 'en', 'fr', 'hu' );
       }
   );

   Verify that only tags matching the custom list are recognized.

Changelog entry

• Automatically create a changelog entry from the details below.

Changelog Entry Details

Significance

• Patch

Type

• Added - for new features

Message

Add Locale from Tags community snippet.

[Copilot]

Pull request overview

This PR adds a new community snippet that automatically sets a post's ActivityPub language based on tags matching language codes (e.g., en, fr, de), enabling proper language metadata for multilingual WordPress sites in the Fediverse.

Changes:

• New locale-from-tags snippet with filter hook to detect language code tags and override the default locale
• Documentation explaining installation, configuration, and usage
• Entry in the main snippets README listing the new snippet

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
snippets/locale-from-tags/locale-from-tags.php	Core snippet implementation with set_locale_from_tags() function and filter hook
snippets/locale-from-tags/README.md	Documentation covering installation, requirements, configuration, and origin
snippets/README.md	Added entry for the new snippet in the snippets directory table
.github/changelog/2923-from-description	Changelog entry for this patch addition

[pfefferle]

Nice one! ♥️