I use polylang with multisite. All kind of categories, menues, posts etc. that I establish can be translated to the languages set up in the settings section as desired. But unfortunately some default denominations of wp like eg "Monthly Archives" will not be translated at all. You may go to http://www.mercedesoasis.info/wordpress/mercedes123/ (under construction)and switch to German. Many default denominations will still be displayed in English and there is no chance to adjust this?