fix(document.title): Update document title for Challenge route

common/app/routes/Challenges/Show.jsx

@@ -15,8 +15,8 @@ import Modern from './views/Modern';
 
 import {
   fetchChallenge,
-
+  challengeSelector,
-  challengeSelector
+  updateTitle
 } from '../../redux';
 import { makeToast } from '../../Toasts/redux';
 import { paramsSelector } from '../../Router/redux';
@@ -33,7 +33,8 @@ const views = {
 
 const mapDispatchToProps = {
   fetchChallenge,
-  makeToast
+  makeToast,
+  updateTitle
 };
 
 const mapStateToProps = createSelector(
@@ -42,12 +43,13 @@ const mapStateToProps = createSelector(
   paramsSelector,
   (
     { dashedName, isTranslated },
-    { viewType },
+    { viewType, title },
-    params,
+    params
   ) => ({
     challenge: dashedName,
     isTranslated,
     params,
+    title,
     viewType
   })
 );
@@ -64,6 +66,8 @@ const propTypes = {
     dashedName: PropTypes.string,
     lang: PropTypes.string.isRequired
   }),
+  title: PropTypes.string,
+  updateTitle: PropTypes.func.isRequired,
   viewType: PropTypes.string
 };
 
@@ -82,12 +86,16 @@ export class Show extends PureComponent {
   }
 
   componentDidMount() {
+    this.props.updateTitle(this.props.title);
     if (this.isNotTranslated(this.props)) {
       this.makeTranslateToast();
     }
   }
 
   componentWillReceiveProps(nextProps) {
+    if (this.props.title !== nextProps.title) {
+      this.props.updateTitle(nextProps.title);
+    }
     const { params: { dashedName } } = nextProps;
     if (
       this.props.params.dashedName !== dashedName &&