I18N: Always search for script translations in `wp-content/languages/plugins`.

Previously, when `WP_PLUGIN_DIR` was set to something other than `wp-content/plugins`, e.g. `wp-content/mods`, `load_script_textdomain` was searching for script translations in `wp-content/languages/mods`. However, that is incorrect, as `WP_PLUGIN_DIR` does not affect where translations are stored. The location is always `wp-content/languages/plugins`.

Props coreymckrill, swissspidy.
Fixes #60891.
Built from https://develop.svn.wordpress.org/trunk@57922


git-svn-id: http://core.svn.wordpress.org/trunk@57423 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/l10n.php

@@ -1189,7 +1189,7 @@ function load_script_textdomain( $handle, $domain = 'default', $path = '' ) {
 		$relative = trim( $relative, '/' );
 		$relative = explode( '/', $relative );
 
-		$languages_path = WP_LANG_DIR . '/' . $relative[0];
+		$languages_path = WP_LANG_DIR . '/plugins';
 
 		$relative = array_slice( $relative, 2 ); // Remove plugins/<plugin name> or themes/<theme name>.
 		$relative = implode( '/', $relative );

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.6-alpha-57921';
+$wp_version = '6.6-alpha-57922';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.