some more fixes to flags, simplifying qs manipulation in flags search

re: #5232

public/language/en-GB/flags.json

@@ -41,6 +41,7 @@
 	"no-history": "No flag history.",
 
 	"state": "State",
+	"state-all": "All states",
 	"state-open": "New/Open",
 	"state-wip": "Work in Progress",
 	"state-resolved": "Resolved",

public/src/client/flags/list.js

@@ -20,16 +20,10 @@ define('forum/flags/list', ['components', 'Chart'], function (components, Chart)
 		}
 
 		filtersEl.find('button').on('click', function () {
-			var payload = filtersEl.serializeArray();
-			var qs = payload.map(function (filter) {
-				if (filter.value) {
-					return filter.name + '=' + filter.value;
-				} else {
-					return;
-				}
-			}).filter(Boolean).join('&');
-
-			ajaxify.go('flags?' + qs);
+			var payload = filtersEl.serializeArray().filter(function (item) {
+				return !!item.value;
+			});
+			ajaxify.go('flags?' + $.param(payload));
 		});
 	};
 

src/controllers/mods.js

@@ -5,7 +5,6 @@ var async = require('async');
 var user = require('../user');
 var flags = require('../flags');
 var analytics = require('../analytics');
-// var adminFlagsController = require('./admin/flags');
 
 var modsController = {
 	flags: {}