The Washington Shakespeare Company, that Arlington outpost of offbeat treatments of classic plays, is going where no D.C. enterprise has ever quite gone before, offering up a whole evening of Shakespeare -- in Klingon. At the company's annual benefit Sept. 25 in Rosslyn, selections from "Hamlet" and "Much Ado About Nothing" will be performed in the language that was invented for the Klingon characters of the "Star Trek" films.