New: Improved page loading errors

Closes #8706

frontend/src/AddMovie/ImportMovie/Import/ImportMovie.js

@@ -1,9 +1,11 @@
 import { reduce } from 'lodash';
 import PropTypes from 'prop-types';
 import React, { Component } from 'react';
+import Alert from 'Components/Alert';
 import LoadingIndicator from 'Components/Loading/LoadingIndicator';
 import PageContent from 'Components/Page/PageContent';
 import PageContentBody from 'Components/Page/PageContentBody';
+import { kinds } from 'Helpers/Props';
 import translate from 'Utilities/String/translate';
 import selectAll from 'Utilities/Table/selectAll';
 import toggleSelected from 'Utilities/Table/toggleSelected';
@@ -105,9 +107,9 @@ class ImportMovie extends Component {
 
           {
             !rootFoldersFetching && !!rootFoldersError ?
-              <div>
+              <Alert kind={kinds.DANGER}>
                 {translate('UnableToLoadRootFolders')}
-              </div> :
+              </Alert> :
               null
           }
 
@@ -116,9 +118,9 @@ class ImportMovie extends Component {
             !rootFoldersFetching &&
             rootFoldersPopulated &&
             !unmappedFolders.length ?
-              <div>
+              <Alert kind={kinds.INFO}>
                 {translate('AllMoviesInPathHaveBeenImported', [path])}
-              </div> :
+              </Alert> :
               null
           }