Pascal Birchler 22796f5869 I18N: Improve support for using only PHP translation files.
This builds on top of the PHP translation file support added in WordPress 6.5, improving the behavior for projects using solely `.l10n.php` translation files and no `.mo.` and `.po` files.

Updates `wp_get_installed_translations()`, which is used when updating language packs and when uninstalling plugins/themes (to remove the translations again), to look for PHP translation files and read metadata from them. Additionally, the file lookup is now cached thanks to using `WP_Textdomain_Registry`.

Updates `Language_Pack_Upgrader::check_package()` to allow language packs that only contain PHP translation files. While WordPress.org continues to serve `.mo` and `.po` files, third-party services might want to only use the PHP file format.

Props swissspidy.
Fixes #60554.

git-svn-id: https://develop.svn.wordpress.org/trunk@58061 602fd350-edb4-49c9-b593-d223f7449a82
2024-04-30 08:34:50 +00:00
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