Filter Hook: This filter is documented in wp-includes/l10n.php
Loads the class messages.
Checks whether the dependencies have been loaded.
Instantiates the plugin services.
Instantiates the plugin core services.
Instantiates the plugin component services.
Instantiates the plugin DB object managers.
Instantiates the module manager.
Sets up capabilities for the plugin DB object managers.
Returns the deactivation callback.