There isn't a specific hook/event after the plugin settings are saved. But you can always listen to the plugin hook 'response', 'action:plugins/settings/save'.
If you get an OKReponse in the hook, everything went well. If you get an ErrorResponse something went wrong.
Learn more: http://learn.elgg.org/en/stable/guides/hooks-list.html#action-hooks
Thanks a lot
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