Add aria label for select element

src/l10n.json

@@ -1,4 +1,5 @@
 {
+    "general.status": "Filter Projects",
     "general.accountSettings": "Account settings",
     "general.about": "About",
     "general.aboutScratch": "About Scratch",

src/views/explore/explore.jsx

@@ -175,6 +175,7 @@ class Explore extends React.Component {
                         </SubNavigation>
                         <Form className="sort-mode">
                             <Select
+                                aria-label={this.props.intl.formatMessage({id: 'general.status'})}
                                 name="sort"
                                 options={[
                                     {