fix SmartSearch menu item missing configuration

SmartSearch evaluates 2 parameters - show_suggested_query and show_explained_query on the results page (/components/com_finder/views/search/tmpl/default_results.php) that haven't been configurable through the menu item configuration since its deployment through jXtended. But it should be configurable whether or not to suggest alternative search terms or explain how to improve the search rather than overriding the view just for this circumstance.
So i added these two options to the menu item configuration file (/components/com_finder/views/search/tmpl/default.xml) and added translation to (/administrator/language/en-GB/en-GB.com_finder.sys) thus enabling the evaluation of these parameters to do what a parameter should do: enable/disable.