Pascal Birchler 117b935b89 I18N: Load translations just-in-time for custom themes and plugins.
In #34114, just-in-time (JIT) translation loading was implemented for projects hosted on WordPress.org. This is now expanded to all other plugins/themes.

Projects with a custom `Text Domain` and `Domain Path` header no longer need to call `load_plugin_textdomain()` or `load_theme_textdomain()`.

This reduces the risk of calling them too late, after some translation calls already happened, and generally makes it easier to properly internationalize a plugin or theme.

This moves the `get_plugin_data()` from `wp-admin/includes/plugin.php` to `wp-includes/functions.php` so it's available during the plugin loading process.

Props swissspidy.
Fixes #62244.
Built from https://develop.svn.wordpress.org/trunk@59461


git-svn-id: http://core.svn.wordpress.org/trunk@58847 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2024-11-26 10:16:17 +00:00
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