public function show($lang, $slug)
 {
     $auction = Auction::findExtended(['slug' => $slug]);
     $watched = isset(Watchlist::where(['user_id' => Auth::user()->id, 'auction_id' => $auction->id])->first()->id);
     return view('auctions.show')->with(['auction' => $auction, 'watched' => $watched]);
 }