fix(acp): small UI fixes for ACP privileges category selector (#6946)

- Add dropdown chevron
- Change translations
- Safety against `category` not an object

src/controllers/admin/privileges.js

@@ -39,10 +39,10 @@ privilegesController.get = function (req, res, callback) {
 			data.allCategories.forEach(function (category) {
 				if (category) {
 					category.selected = category.cid === cid;
-				}
 
-				if (category.selected) {
-					data.selected = category;
+					if (category.selected) {
+						data.selected = category;
+					}
 				}
 			});
 

src/views/admin/manage/privileges.tpl

@@ -6,9 +6,9 @@
 			</p>
 
 			<p class="lead">
-				Currently viewing privileges for
+				[[admin/manage/categories:privileges.category-selector]]
 				<button type="button" id="category-selector" class="mdl-button mdl-js-button mdl-button--raised mdl-button--colored">
-					{selected}
+					{selected} <i class="fa fa-angle-down"></i>
 				</button>
 
 				<ul class="mdl-menu mdl-menu--bottom-left mdl-js-menu mdl-js-ripple-effect" for="category-selector">