handle language fetch failure

ui/constants/action_types.js

@@ -186,6 +186,7 @@ export const FETCH_REWARD_CONTENT_COMPLETED = 'FETCH_REWARD_CONTENT_COMPLETED';
 
 // Language
 export const DOWNLOAD_LANGUAGE_SUCCESS = 'DOWNLOAD_LANGUAGE_SUCCESS';
+export const DOWNLOAD_LANGUAGE_FAILURE = 'DOWNLOAD_LANGUAGE_FAILURE';
 
 // Subscriptions
 export const CHANNEL_SUBSCRIBE = 'CHANNEL_SUBSCRIBE';

ui/redux/actions/settings.js

@@ -182,6 +182,11 @@ export function doFetchLanguage(language) {
               language,
             },
           });
+        })
+        .catch(e => {
+          dispatch({
+            type: LOCAL_ACTIONS.DOWNLOAD_LANGUAGE_FAILURE,
+          });
         });
     }
   };