WordPress at a glance
filter is not described

async_update_translation filter-hook . WP 4.0.0

Filters whether to asynchronously update translation for core, a plugin, or a theme.

Usage

add_filter( 'async_update_translation', 'filter_function_name_7358', 10, 2 );
function filter_function_name_7358( $update, $language_update ){
	// filter...

	return $update;
}
$update(true/false)
Whether to update.
$language_update(object)
The update offer.

Where the hook is called

Language_Pack_Upgrader::async_upgrade()
wp-admin/includes/class-language-pack-upgrader.php 82
$update = apply_filters( 'async_update_translation', $update, $language_update );

Where the hook is used (in WP core)

Does not used.