Local use preference show a table with untranslatables options This pref is displayed when you call systempreferences.pl The untranslatable file is /koha-tmpl/intranet-tmpl/prog/en/modules/admin/systempreferences.tt.
Local use pulls the descriptions from the database and can be used to add your own configuration options for locally developed features. It displays also some preferences that are for one reason or another not part of the .pref files I am not sure how this could be fixed and I think other fixes like making authorised values translatable would be more urgent.