wp_get_translation_updates()

function wp_get_translation_updates() {
	$updates = array();
	$transients = array( 'update_core' => 'core', 'update_plugins' => 'plugin', 'update_themes' => 'theme' );
	foreach ( $transients as $transient => $type ) {
		$transient = get_site_transient( $transient );
		if ( empty( $transient->translations ) )
			continue;

		foreach ( $transient->translations as $translation ) {
			$updates[] = (object) $translation;
		}
	}
	return $updates;
}