Add messages informing that collections are empty (fixes #4115) (#8418)

* Add messages informing that collections are empty

Adds empty messages to blocked users, domain blocks, favourited statuses, users
that favourited toot, follow requests, followers of given user, user's being
followed by given user, lists, muted users, toots' boosts.

Switched from using ScrollContainer to ScrollableList and/or added empty
message's text.

Fixes #4115

* Update localization files with strings for #4115

* Fix whitespace issues pointed out by codeclimate

app/javascript/mastodon/features/favourited_statuses/index.js

@@ -7,7 +7,7 @@ import Column from '../ui/components/column';
 import ColumnHeader from '../../components/column_header';
 import { addColumn, removeColumn, moveColumn } from '../../actions/columns';
 import StatusList from '../../components/status_list';
-import { defineMessages, injectIntl } from 'react-intl';
+import { defineMessages, injectIntl, FormattedMessage } from 'react-intl';
 import ImmutablePureComponent from 'react-immutable-pure-component';
 import { debounce } from 'lodash';
 
@@ -71,6 +71,8 @@ export default class Favourites extends ImmutablePureComponent {
     const { intl, shouldUpdateScroll, statusIds, columnId, multiColumn, hasMore, isLoading } = this.props;
     const pinned = !!columnId;
 
+    const emptyMessage = <FormattedMessage id='empty_column.favourited_statuses' defaultMessage="You don't have any favourite toots yet. When you favourite one, it will show up here." />;
+
     return (
       <Column ref={this.setRef} label={intl.formatMessage(messages.heading)}>
         <ColumnHeader
@@ -92,6 +94,7 @@ export default class Favourites extends ImmutablePureComponent {
           isLoading={isLoading}
           onLoadMore={this.handleLoadMore}
           shouldUpdateScroll={shouldUpdateScroll}
+          emptyMessage={emptyMessage}
         />
       </Column>
     );